Rewild Genomics / De-extinction Programs / Dodo
Extinct · c. 1681

Dodo

Raphus cucullatus · Mauritius

The dodo lived in complete isolation on Mauritius for millions of years, losing its ability to fly because nothing on the island required it to flee. Within 80 years of human contact, it was gone. No other extinction has so thoroughly entered cultural memory as a symbol of senseless loss.

c. 1681
Year of extinction
~23 kg
Body mass
~1 m
Standing height
Columbidae
Family
Natural history

A pigeon that
became a giant

The dodo was a pigeon. More precisely, it was the descendant of pigeons that reached Mauritius by flight and, finding no land predators and abundant food, gradually evolved into something far larger and altogether flightless over millions of years. Its closest living relative is the Nicobar pigeon, a brilliantly colored bird of Southeast Asia that still flies.

At around 23 kilograms, the dodo was one of the largest birds in the Indian Ocean. It had a robust, hooked bill suited to hard seeds and fallen fruit. Its wings had become vestigial stubs. Its legs were thick and sturdy. It nested on the ground, laid a single egg, and had no behavioral fear of large animals. On an island without predators, fear was an unnecessary expense.

The dodo's famous clumsiness and stupidity are largely inventions of sailors who observed terrified, captive birds in stressed conditions. Free-ranging birds on Mauritius were likely capable and well-adapted animals. Their boldness around humans was simply a product of having never encountered an animal that wanted to kill them. They had no evolutionary frame of reference for what was coming.

Reconstruction of a dodo in Mauritian forest

Artist's reconstruction, Raphus cucullatus in lowland Mauritian forest

"The dodo and the Nicobar pigeon share a common ancestor. One is extinct. The other is the best genetic proxy we have."

Most of what we know about the dodo comes from Dutch sailors who first arrived in Mauritius in 1598. They left detailed written and illustrated accounts, along with bones that have since been recovered from swamp deposits across the island. Only a handful of complete skeletons exist in museum collections worldwide.

The dodo was ecologically central to the Mauritian forest. It likely dispersed the seeds of the tambalacoque tree, which was already in serious decline by the late 19th century. Whether this was a true obligate relationship is debated, but the dodo's disappearance set off a cascade of ecological losses that continues today.

Reconstruction of a dodo moving through dense Mauritian forest undergrowth

Reconstruction — Raphus cucullatus foraging in lowland forest interior

Extinction

Eighty years
from contact to gone

The dodo's extinction happened with extraordinary speed. Dutch sailors arrived in Mauritius in 1598. The last credible sighting was recorded in 1681. That is less than a century from first contact to complete eradication on a single island.

Hunting was one factor. Sailors found dodos easy to catch and ate them regularly, though accounts differ on whether they were considered good eating. More damaging were the animals that came with the ships: rats, pigs, cats, and macaques found dodo eggs and chicks completely defenseless on the ground. A bird that had never needed to protect its nest from anything was not going to learn in a generation.

Habitat destruction compounded everything. The Dutch began logging the island's forests almost immediately, replacing them with sugar plantations and settlements. The dodo's nesting and feeding habitat shrank decade by decade. By the time anyone thought to document the bird systematically, very few remained to document.

What makes the dodo's extinction particularly striking is how completely it caught everyone off guard. There is no record of anyone noticing the population collapsing, no attempt at protection, no alarm. One decade there were dodos; the next, there weren't. The concept of a human-caused extinction of an entire species was simply not part of how 17th-century Europeans thought about the world.

Millions of years BP
Colonization of Mauritius
Ancestors of the dodo, likely resembling the Nicobar pigeon, reach Mauritius. In the absence of ground predators, flight becomes unnecessary and the lineage evolves toward larger, flightless form over millions of years.
1598
Dutch arrival
The Dutch East India Company establishes a base at Mauritius. Sailors encounter the dodo and begin hunting it. They also bring rats, dogs, pigs, and cats ashore. This is the beginning of the end.
1638
Permanent Dutch settlement
Mauritius becomes a permanent colony. Forest clearance for sugar cultivation begins in earnest. Introduced mammals are now established island-wide, preying on dodo nests continuously.
1662
Volkert Evertsz sighting
One of the last credible sightings of the dodo is recorded by Dutch sailor Volkert Evertsz, who describes capturing several birds on a small islet. The main island population is already believed to be nearly gone.
c. 1681
Last known individual
The last verified record of a dodo. Within 83 years of European contact, the species has been eliminated from the only place it ever existed. No organized effort to preserve it was ever made.
Reconstruction of a dodo tending a single egg in a ground nest near the Mauritian coastline

Reconstruction — a dodo tending its nest, Mauritius coastline. Ground-nesting with a single egg left the species completely vulnerable to introduced predators.

Dutch sailors hunting dodos on Mauritius, 17th century

Dutch sailors hunting dodos on Mauritius, c. 1600s. The birds had no behavioral response to large predators and were easily killed on approach.

Factor 01
Introduced Predators
Rats, pigs, cats, and macaques brought by Dutch settlers preyed relentlessly on dodo eggs and chicks. A bird that had nested on the ground for millions of years with no predators had no behavioral response to this. Nest failure likely became near-total within a few generations.
Factor 02
Habitat Destruction
Dutch colonists cleared Mauritius's lowland forests for agriculture within decades of settlement. The dodo's food sources, nesting sites, and ranging habitat were systematically eliminated as sugar cultivation expanded across the island.
Factor 03
Evolutionary Naivety
The dodo had no evolutionary history with large predators. It did not flee from humans, did not protect its nest aggressively, and did not adapt its behavior to the new threat landscape quickly enough. This naivety was shaped by millions of years of isolation, not by stupidity.
Genomics research

A genome recovered
from subfossil bone

The dodo's genome was sequenced in 2022 from subfossil specimens held at the Natural History Museum in Oxford and the Naturalis Biodiversity Center in Leiden. The resulting genome is high quality by ancient DNA standards, providing a solid foundation for comparative genomic work. Mauritius's relatively warm, humid climate is not ideal for DNA preservation, making this a more challenging sequencing target than permafrost specimens.

The closest living relative is the Nicobar pigeon, and the two species share a common ancestor that lived roughly 20 to 25 million years ago. The Nicobar pigeon genome has been sequenced and serves as the primary reference for identifying the genetic changes that drove the dodo's dramatic morphological divergence: the loss of flight, the increase in body size, and the thickening of the skeletal structure.

The genetic architecture of flightlessness is of particular scientific interest. Several bird lineages have independently evolved flightlessness, and the dodo offers a case study in how rapidly this transition can occur and which regulatory pathways are involved. The dodo's bone histology also suggests a relatively fast growth rate compared to other large birds, which has potential relevance to any future revival program.

Rewild Genomics is developing comparative genomic pipelines for the dodo and Nicobar pigeon, focused on identifying the regulatory and coding variants responsible for the dodo's distinctive morphology. The Nicobar pigeon is a good living proxy because it is the closest relative, but the two species diverged long enough ago that the genomic differences are extensive and prioritization of high-impact loci is a meaningful scientific problem.

Research program: Dodo

Rewild Genomics is building comparative genomic analysis pipelines for the dodo, using the 2022 nuclear genome and the Nicobar pigeon as the reference species. Our focus is on the regulatory variants underlying flightlessness and body-size expansion, and on developing open-source methods applicable to island bird de-extinction more broadly.

The dodo's subfossil specimens are relatively recent by geological standards, which gives us good genomic coverage. The primary challenge is not data quality but analytical: distinguishing the functional variants that drove phenotypic change from the much larger background of neutral divergence accumulated over 20 million years of separation.

2022 nuclear genome Subfossil bone specimens Nicobar pigeon proxy NCBI / GenBank Flightlessness loci
Context

Colossal Biosciences announced a dodo de-extinction program in 2023, partnering with Beth Shapiro at UC Santa Cruz, whose lab produced the 2022 genome. Rewild Genomics approaches this species from a complementary angle: our open-source pipelines and methods are publicly available and designed to advance the science regardless of which organization leads the revival effort.

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