The Ancestor's Tale
| Company type | Book |
|---|---|
| Industry | Scientific publication |
| Founded | 2004 |
| Founder | Richard Dawkins, Yan Wong |
| Products | Scientific book on evolution |
The Ancestor's Tale: A Pilgrimage to the Dawn of Life is a 2004 scientific publication authored by Richard Dawkins and Yan Wong that investigates evolution by retracing human ancestry in reverse chronological order. At each convergence point with a particular evolutionary branch, the book focuses on an organism from that lineage to demonstrate fundamental evolutionary principles.
Its title and narrative structure pay homage to Geoffrey Chaucer's The Canterbury Tales, where travelers gather and exchange stories.
Synopsis
The narrative proceeds backward through evolutionary history, encountering various groups of organisms. Each collection of species shares a most recent common ancestor, which the authors term a "concestor." The earliest concestor identified is LUCA (Last Universal Common Ancestor), symbolizing the root of all extant life forms, supported by the universal nature of the genetic code. The book challenges the notion of multiple independent origins of life, arguing that any newly emerging life forms would likely be outcompeted and consumed by already established organisms.
Presented as a "pilgrimage," The Ancestor's Tale marks 40 distinct rendezvous points, each representing a shared ancestor between humans and other species, culminating at the origin of life itself.
Its design draws inspiration from Chaucer’s pilgrims, exploring themes such as speciation, the neotenous traits of axolotls, difficulties in classifying animals, and the evolutionary shift from fish-like ancestors to terrestrial vertebrates.
Concestors
The term concestor, introduced by Nicky Warren and adopted by the authors, refers to the most recent common ancestor encountered at each rendezvous. At every meeting point, readers are introduced to the concestor shared between humans and the respective species or groups. This ancestor may not closely resemble its descendants. Following each rendezvous, the accompanying "pilgrims" have evolved to a degree comparable to humans. Additional pilgrims join this retrospective journey as it progresses further back in time.
Prologue
| Rendezvous point | Time | Significant event | Story |
|---|---|---|---|
| n/a | 0.01 mya | Neolithic Revolution | The Farmer's Tale recounts the Neolithic Revolution |
| n/a | 0.04 mya | Great Leap Forward | The Cro-Magnon's Tale narrates the Great Leap Forward. |
Primates
| Rendezvous point | Time | New Pilgrim | Story |
|---|---|---|---|
| 0 | All Humankind | The Tasmanian's Tale illustrates the concept of identical ancestors point, where all living humans share an identical set of forebears. | |
| Eve's Tale explores coalescent theory, including concepts such as Mitochondrial Eve, Y-chromosomal Adam, and biological polymorphism. It hypothesizes that human and chimpanzee ABO blood group system similarities may represent trans-specific polymorphisms. | |||
| The Ergast's Tale describes how a mutation in the FOXP2 gene might have facilitated language development in Homo ergaster. | |||
| The Handyman's Tale discusses how Homo habilis achieved a high 'brain to body mass ratio', introducing analytical tools such as the logarithmic scale and scatterplot. | |||
| Little Foot's Tale investigates how early hominids adapted to walking upright on two legs. | |||
| 1 | 6 mya | Chimpanzees | Human pilgrims encounter their evolutionary relatives, the chimpanzees and bonobos. See also Chimpanzee–human last common ancestor |
| 2 | 7 mya | Gorillas | The Gorilla's Tale addresses human perceptions of great apes, concluding with discussions on racism, speciesism, and initiatives like the Great Ape Project. See also Gorilla–human last common ancestor |
| 3 | 14 mya | Orangutans (Pongo) | The Orangutan's Tale introduces parsimony principles in building phylogenetic trees (Cladistics) and identifies orangutans as the final great ape joining this pilgrimage. See also Orangutan–human last common ancestor |
| 4 | 18 mya | Gibbons (Hylobatidae) | The Gibbon's Tale delves into neighbor-joining methods, parsimony, and computational phylogenetic techniques such as maximum likelihood analysis addressing 'long branch attraction'. It emphasizes trans-specific polymorphisms like sexual dimorphism in the SRY gene, underscoring that species trees represent summaries of numerous gene trees. Gibbons are noted as the last ape group to join. See also Gibbon–human last common ancestor |
| 5 | 25 mya | Old World monkeys (Cercopithecidae) | Old World monkeys belong to the same clade (Catarrhini) as apes and are closer relatives than New World monkeys; they are sometimes referred to as 'tailed apes.' The presence or absence of tails in their common ancestor remains uncertain. |
| 6 | 40 mya | New World monkeys (Platyrrhini) | The Howler Monkey's Tale explains gene duplication events leading to new genes over evolutionary time. During the dinosaur era, mammals were nocturnal and dichromatic; humans later evolved trichromatic vision through opsin gene duplication aiding in foraging. New World monkeys exhibit trichromacy mainly in females via X-linked alleles; howler monkeys uniquely possess two loci for red and green alleles, enabling trichromacy in both sexes. These monkeys likely crossed the Atlantic once and now reside solely in South America. |
| 7 | 60 mya | Tarsiers | Nocturnal primates with large eyes lacking a tapetum lucidum to prevent image blurring; their ancestors were diurnal. The earliest fossil representative, Archicebus, was found in China. |
| 8 | 65 mya | Lemurs and Bushbabies | The journey meets strepsirrhine relatives including lemurs, pottos, bushbabies, and lorises. The Aye-Aye's Tale highlights Madagascar’s distinctive lemur fauna. Madagascar separated from Gondwana alongside Africa and India, becoming isolated land that fostered speciation; a small founding population of strepsirrhines diversified into numerous ecological roles without competition from monkeys. Despite covering only about 0.1% of Earth's land surface, Madagascar is home to unique species accounting for approximately 4% of global animal and plant diversity. |
Non-primate mammals
| Meeting point | Era | Representative group | Description |
|---|---|---|---|
| 9 | 70 million years ago | Colugos | Following the mass extinction event, a variety of nocturnal, shrew-like insectivores within the Afrotheria group emerged, adapting to newly available ecological roles. |
| 10 | 70 million years ago | Treeshrews | Although resembling squirrels, tree shrews are not rodents. Their evolutionary relationship with colugos remains under investigation, analogous to the narrative found in the Gibbon's Tale. |
| 11 | 75 million years ago | Rodents and Rabbit relatives (Glires, Supraprimates, or euarchontoglires) | Rodents represent the most abundant mammalian order worldwide, encompassing species such as dormice, pikas, and squirrels. |
| The Mouse's Tale emphasizes that humans and mice share approximately 20,000 genes; however, phenotypic diversity results from epigenetic mechanisms influencing gene expression rather than gene quantity. | |||
| The Beaver's Tale revisits Dawkins' extended phenotype theory: a beaver’s dam serves as a manifestation of its genetic influence, illustrating how genes can drive environmental modifications through behavior. | |||
| 12 | 85 million years ago | Laurasiatheres | This genetically defined clade consists of around 2,000 species including Carnivora (dogs, cats, bears, seals), Perissodactyla (horses, rhinoceroses), Cetartiodactyla (deer, giraffes, cattle), and Chiroptera (bats). The grouping is based on genetic data rather than morphological traits and is named after the ancient supercontinent Laurasia. |
| The Hippo's Tale details how whales evolved from terrestrial artiodactyl ancestors; hippos are their closest living relatives, demonstrating swift evolutionary shifts in new habitats. | |||
| The Seal's Tale explores sex ratio dynamics in polygynous species such as elephant seals, highlighting sexual dimorphism and parental investment concepts relevant to evolutionary biology. | |||
| 13 | 90 million years ago | Xenarthrans and Afrotheres |
This group includes elephants, elephant shrews, dugongs, manatees, hyraxes, and aardvarks. Afrotheres have African origins while Xenarthrans hail from South America; they are thought to be more closely related to each other. |
| The Sloth's Tale addresses South America's geographic isolation fostering both marsupial and placental mammals occupying ecological niches. The Great American Interchange later facilitated cross-continental species exchanges that significantly influenced ecosystems. | |||
| 14 | 160 million years ago | Marsupials | Marsupials initially evolved in North America but are now predominantly found in Australia and New Guinea. A single ancestor resembling an opossum migrated across Antarctica before Australia separated, leading to diversification into species that filled niches vacated by dinosaurs. |
| The Marsupial Mole's Tale demonstrates how marsupials independently developed analogues to moles, mice, flying squirrels, and wolves within Australia. However, ecological limitations prevented the evolution of marsupial equivalents to whales or bats. | |||
| 15 | 180 million years ago | Monotremes | Only five monotreme species remain today. Echidnas likely descended from platypus-like ancestors. They exhibit a combination of mammalian traits such as endothermy alongside reptilian characteristics like egg-laying. |
| The Duckbill's Tale warns against viewing the platypus as primitive; it has developed sophisticated electroreception with tens of thousands of sensors on its bill and males possess venomous spurs targeting nerve endings. |
Non-mammalian chordates
| Meeting Point | Epoch | New Pilgrim | Narrative | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 16 | 320 mya | Sauropsids | The classification "reptile" does not represent a true clade, as it excludes birds despite their shared evolutionary lineage. Although extinct dinosaurs are not included, their extant descendants—the birds—participate in this evolutionary journey. | ||||||||
| The Lava Lizard Story showcases the rich biodiversity of the Galapagos Islands. | |||||||||||
| The Galapagos Finch Story demonstrates accelerated evolutionary changes. In the 1977 drought, finches that survived were over 5% larger with more robust beaks, better suited for processing tough seeds. Larger males gained survival and mating advantages, driving population shifts toward increased size and beak dimensions through sexual selection. When environmental conditions normalized, finches with smaller beaks regained competitive benefits. | |||||||||||
| The Peacock Story illustrates how sexual selection influences male feather ornamentation to attract mates, mirroring patterns seen in human sexual dimorphism. | |||||||||||
| The Dodo Story recounts the loss of flight in Mauritius due to absence of predators and eventual extinction caused by introduced species and habitat degradation within two hundred years. | |||||||||||
| The Elephant Bird Story updates insights into Madagascar’s enormous flightless birds and their connections to local myths. | |||||||||||
| 17 | 340 mya | Amphibians | Amphibians—including frogs, toads, and salamanders—maintain aquatic egg deposition and permeable skin, restricting them to freshwater environments. They share a common tetrapod ancestor with mammals and reptiles. | ||||||||
| The Salamander Story uses ring species such as California’s Ensatina salamanders to exemplify continuous interbreeding populations forming genetic rings while exhibiting reproductive isolation at terminal ends. | |||||||||||
| The Narrowmouth Toad Story describes parapatric speciation where overlapping toad populations reinforce reproductive barriers through divergent mating calls. | |||||||||||
| The Axolotl Story explores metamorphosis alongside pedomorphosis, highlighting axolotls’ retention of larval traits into sexual maturity (neoteny) and their potential for evolutionary adaptability. | |||||||||||
| 18 | 415 mya | Lungfish (Dipnoi) | Although lungfish resemble coelacanths morphologically, they differ genetically after over 400 million years of divergence. Lungfish possess the largest known genome, comprising approximately 133 billion base pairs. | ||||||||
| The Lungfish Story traces evolutionary transitions from ray-finned fishes through Tiktaalik, proposing that early tetrapods navigated between tidal pools rather than immediately colonizing terrestrial habitats. | |||||||||||
| 19 | 420 mya | Coelacanths (Latimeria) | The Coelacanth Story recounts the rediscovery of this so-called "living fossil," challenges its traditional status, and discusses transposable genetic elements within its genome. | ||||||||
| 20 | 430 mya | Ray-Finned Fish | Ray-finned fishes, including species such as sturgeon, carp, salmon, and seahorses, share a common ancestor with lobe-finned fishes at node 19 (bony fish). The majority belong to the infraclass teleostei. | ||||||||
| Certain teleost species evolved distinctive morphologies suited to specific ecological niches: the leafy sea dragon camouflages among seaweed; the razorfish swims vertically amid sea urchins; the snipe eel exhibits an elongated form; and the ocean sunfish has a large disc-like shape. The Leafy Sea Dragon Story exemplifies adaptive morphological evolution. | |||||||||||
| The Pike Story explains how the swim bladder evolved from a primitive lung structure repurposed for buoyancy regulation and auditory functions in teleost fishes. | |||||||||||
| The explosive diversification of haplochromine cichlids in African lakes demonstrates adaptive radiation. The Cichlid Story discusses phylogenetic reconstruction using mitochondrial DNA haplotype networks to elucidate speciation processes. | |||||||||||
| The Blind Cave Fish Story illustrates eye degeneration in cave-dwelling populations due to resource allocation trade-offs, exemplifying vestigial traits and evolutionary irreversibility consistent with Dollo's Law. | |||||||||||
| The Flounder Story reveals imperfect evolutionary outcomes such as asymmetrical head positioning adapted for benthic life, underscoring natural selection’s gradualism without foresight or perfection. | |||||||||||
| 21 | 460 mya | Sharks (Chondrichthyes) | Sharks and rays feature cartilaginous skeletons covered by dermal denticles; lacking swim bladders, they maintain buoyancy through continuous swimming, urea retention, and lipid-rich livers. Node 21 marks the emergence of jawed vertebrates with jaws derived from modified gill arches. | ||||||||
| 22 | 525 mya | Lampreys and Hagfish (Cyclostomata) |
Jawless fishes such as lampreys and hagfish represent primitive vertebrates retaining a notochord throughout life instead of ossified vertebrae. They preserve fundamental chordate features but diverged prior to jaw evolution. | ||||||||
| The Lamprey Story elaborates on gene ancestry contrasting organismal phylogenies with gene lineages. Lampreys lack alpha/beta globin gene duplications found in jawed vertebrates, reflecting their ancient evolutionary split. This narrative emphasizes differing perspectives on ancestry at organism versus gene levels. | 23 | 535 mya | Sea Squirts (Urochordata) | Molecular data reposition sea squirts relative to lancelets. Adult sea squirts are sessile filter feeders with distinct morphology; however, their larvae resemble tadpoles exhibiting chordate characteristics. Vertebrate origins may involve neoteny from similar larval forms. Sea squirts display rapid molecular evolution rates. | 24 | 540 to 775 mya | Lancelets (Amphioxiformes) | Lancelets exemplify chordates possessing a notochord, dorsal nerve cord, and gill slits but represent extant species rather than ancestral forms. | |||
| The Lancelet Story reinforces that all extant animals have undergone equal evolutionary change since their last common ancestor; fossils represent distant relatives preserved in geological time rather than direct progenitors. |
Non-chordate animals
Starting with lancelets, pinpointing exact dates becomes difficult and often debated.
| Meeting point | Date | New Pilgrim | Description |
|---|---|---|---|
| 25 | 550 million years ago | Ambulacrarians | This category encompasses echinoderms and species such as Xenoturbella, which recent genetic studies have identified as distant echinoderm relatives. |
| 26 | 560 million years ago | Protostomes |
The division between protostomes and deuterostomes marks the foundation of kingdom Animalia. In protostomes ('mouth first'), the initial embryonic opening develops into the mouth; in deuterostomes (including humans), it forms the anus. This common ancestor, often referred to as Urbilaterian, gave rise to Insecta, which account for approximately 75% of all animal species. |
| The Ragworm's Tale investigates the development of bilateral symmetry. | |||
| The Brine Shrimp's Tale explores the origins of chordates. | |||
| The Leaf Cutter's Tale analyzes ant colonies and their fungal farming. | |||
| The Grasshopper's Tale addresses issues of racial prejudice. | |||
| The Fruit Fly's Tale introduces the concept of Hox genes. | |||
| The Rotifer's Tale examines the contradictions in sexual versus asexual reproduction. | |||
| The Barnacle's Tale discusses fossil records and misleading physical forms. | |||
| The Velvet Worm's Tale covers the events of the Cambrian explosion. | |||
| 27 | 570 million years ago | Acoelomorph Flatworms | Their classification remains uncertain due to molecular evolutionary data. These organisms lack both an anus and a coelom, with internal organs embedded within parenchymal tissue. |
| 28 | 590 million years ago | Cnidarians | The Jellyfish's Tale details vertical migration patterns linked to circadian rhythms. |
| The Polypifer's Tale reviews Darwin’s hypothesis on coral reef formation and highlights ecological cooperation driven by individual benefits rather than collective advantage. | |||
| 29 | 600 million years ago | Ctenophores (Comb jellies) | Their phylogenetic position is debated; they might represent an outgroup to all animals, suggesting muscles and nerves evolved independently or were lost in sponges. Genetic analyses are complicated by incomplete lineage sorting phenomena. |
| 30 | 620 million years ago | Placozoans | Consisting of a single species, these resemble multicellular amoebas. |
| 31 | 650 million years ago | Sponges | The earliest known animals; sessile but capable of coordinated cellular movement. Molecular evidence indicates two distinct sponge lineages. Sponge cells possess totipotency. |
| The Sponge's Tale recounts a 1907 experiment where sponge cells were combined to regenerate new adult sponges. |
Non-animal Eukaryotes
The second edition incorporates a new rendezvous point (#33) and provides clarification on a previously uncertain topic.
| Rendezvous Point | Approximate Time | New Pilgrim | Narrative |
|---|---|---|---|
| 32 | 800 million years ago | Choanoflagellates (Choanoflagellatea) | The Choanoflagellate's Tale delves into the origins of multicellularity. As the closest unicellular relatives to animals, choanoflagellates form transient colonies. The similarity between sponge choanocytes and these cells sheds light on multicellularity’s beginnings, tracing back to a shared ancestor known as the urmetazoan. |
| 33 | 900 million years ago | Filastereans (Filasterea) | Introduced in the second edition following 2008 findings, this addition also led to adjustments in other timeline entries. |
| 34 | 1000 million years ago | DRIPs (Mesomycetozoea) | Originally named after four genera, these unicellular parasites infect fish and freshwater species; DNA sequencing has expanded the group to roughly 50 species. Their lineage precedes parasitic behavior. |
| 35 | 1200 million years ago | Fungi | Although an estimated 4 million fungal species exist, only about 99,000 have been formally described. |
| 36 | (?) | Uncertain | The protozoan assemblage Apusozoa consists of three protist categories: breviata, ancyromonads, and apusomonads. |
| 37 | (?) | Amoebozoans (Amoebozoa) | The term 'amoeba' refers to shape rather than classification; numerous unrelated eukaryotes display amoeboid characteristics. |
| 38 | (?) | A broad clade including Excavata, the SAR supergroup, glaucophytes, red algae, and green plants. | The Cauliflower's Tale illustrates how tissue transport systems scale according to a 3/4 power law, observable in both cauliflower structures and brain anatomy. |
| The Redwood's Tale outlines radiometric dating techniques ranging from Uranium–lead to Carbon isotopic methods applied across geological epochs. | |||
| The Humped Bladderwort's Tale focuses on the concept of the C value, representing DNA quantity within organisms. | |||
| The Mixotrich's Tale portrays a protist inhabiting Australian termite guts that harbors various symbiotic partners both inside and externally. |
Great Historic Rendezvous
This concise section in the second edition highlights the pivotal development of eukaryotic cells alongside the endosymbiotic theory proposed by Lynn Margulis.
Prokaryotes
Prokaryotic organisms exchange genetic information not only through traditional ("vertical") inheritance but also via horizontal gene transfer, spanning unicellular and multicellular life forms.
| Rendezvous Point | Approximate Time | New Pilgrim | Narrative |
|---|---|---|---|
| 39 | (?) | Archaea | Archaea possess genes and metabolic pathways more closely aligned with eukaryotes, including enzymes essential for transcription and translation (biology) processes. |
| 40 | (?) | Eubacteria | The Rhizobium's Tale examines the emergence of flagellar rotary motors and the difficulties faced by larger organisms in evolving wheeled movement. |
| Taq's Tale emphasizes the importance of a robust enzyme pivotal to PCR technology. |
Origin of life
The authors investigate the beginnings of life by examining ideas such as the RNA world, the enterobacteria phage Qbeta, the Miller–Urey experiment, and the hypercycle involving DNA, RNA, and enzymes that underpin primordial biochemical networks.
Reception
Carl Zimmer from the New York Times commended the book as a valuable tool for comprehending evolutionary lineages.
The Guardian highlighted the linguistic difficulty yet originality in narrating evolution by tracing backward from humans. Matt Ridley praised this reverse chronological journey, underscoring its departure from an anthropocentric perspective on evolution.
Translations
| Edition | Title | Translator | Year |
|---|---|---|---|
| Bulgarian | Сказанието на прадедите | Krassimira Mateva (Красимира Матева) | 2013 |
| Chinese (Traditional) | 祖先的故事 | Gu Xiaozhe (顧曉哲) | 2020 (2nd edition) |
| Czech | Příběh předka | Pavel Růt | 2008 |
| Danish | Vores forfædres fortælling | Lotte Follin | 2019 (2nd edition) |
| Dutch | Het verhaal van onze voorouders | Mark van Nieuwstadt | 2007 |
| French | Il était une fois nos ancêtres | Marie-France Desjeux-Lefort | 2007 |
| German | Geschichten vom Ursprung des Lebens | Sebastian Vogel | 2008 |
| Hungarian | Az Ős meséje – Zarándoklat az élet hajnalához | Kovács Lajos | 2006 |
| Italian | Il racconto dell'antenato | L. Serra | 2004 |
| Korean | 조상 이야기 | Lee Han-eum (이한음) | 2005 |
| Persian | داستان نیاکان | ||
| Polish | Opowieść przodka | Sobolewska Agnieszka | 2018 |
| Portuguese | A grande história da evolução | Laura Teixeira Motta | 2009 |
| Spanish | Historia de nuestros ancestros | Víctor Vicente Úbeda | 2008 |
| Turkish | Ataların hikâyesi | Ahmet Fethi | 2015 |
| Serbian | Priče naših predaka | Tatjana Bižić | 2013 |
| Russian | Рассказ предка | S. I. Dolotovskaya (С. И. Долотовская) | 2015 |
See also
External links
- Video introduction by Richard Dawkins
- Richard Dawkins on "Science Friday"
- Family and kid's programs inspired by Ancestors Tale, created by Connie Barlow, featuring video and slides
- OneZoom, an interactive fractal tree of life explorer, utilized for visualizations in The Ancestor's Tale