The passenger pigeon was once the most abundant bird in North America, and possibly the world. In the early 19th century, flocks numbered in the billions; a single migrating column could darken the sky for hours and take days to pass overhead. Ornithologist Alexander Wilson estimated one flock at over two billion birds, and John James Audubon described a 1813 flight near the Ohio River that blotted out the sun. By conservative estimates the species made up a quarter to a third of all birds on the continent.
Within the span of a single human lifetime, it went to zero. On September 1, 1914, a bird named Martha — the last known passenger pigeon alive anywhere — died in her cage at the Cincinnati Zoo. She was roughly 29 years old and had never produced a surviving chick. Her body was packed in a 300-pound block of ice and shipped to the Smithsonian, where she was skinned, mounted, and catalogued. The most numerous bird on the continent had a precise, recorded extinction: a date, a place, a name.
The cause was not mysterious. Commercial hunting on an industrial scale — the telegraph and railroad let hunters find and ship roosts faster than the birds could breed — combined with the destruction of the eastern forests the pigeons needed to nest in enormous colonies. The species depended on sheer numbers to breed and to survive predators; once the flocks fell below a critical mass, the survivors could not sustain themselves.
Martha’s death became the moment American conservation lost its innocence. That the most abundant bird imaginable could be exterminated by people, on purpose, within living memory, helped drive the laws and the change in thinking that followed.
The great auk (Pinguinus impennis) was a large, flightless seabird of the North Atlantic and the original “penguin” — the name was applied to it long before it was transferred to the unrelated birds of the Southern Hemisphere. Standing around 75–85 cm tall and weighing roughly 5 kg, it was black above and white below, with a heavy hooked bill marked by deep grooves and a distinctive white patch in front of each eye. Superbly adapted to swimming and diving but unable to fly, it came ashore only to breed, on a handful of remote rocky islets.
Its breeding range stretched across the North Atlantic, from islands off eastern Canada — most famously Funk Island off Newfoundland — to St Kilda off Scotland and the volcanic skerries of Geirfuglasker and Eldey off Iceland. On land, where it was clumsy and defenceless, vast colonies made it brutally easy to harvest.
For centuries the great auk was killed for its meat, its eggs, its fat (rendered for oil) and its down. The slaughter intensified during the great Funk Island feather trade, when crews killed the birds in enormous numbers and rendered them in cauldrons. As the species grew scarce, a second and decisive pressure emerged: museums and private collectors, eager to obtain skins and eggs of an obviously vanishing bird, paid rising prices that turned the last survivors into prizes — a documented case of extinction accelerated by collecting.
The last confirmed pair of great auks was killed on the Icelandic islet of Eldey on 3 June 1844, taken for a collector; the single egg they had been incubating was crushed in the process. Their deaths are among the best-documented extinction events of any species, and the great auk became an early and powerful argument for the protection of birds.
The Carolina parakeet (Conuropsis carolinensis) was the only parrot species native to the eastern United States and the only member of its genus. A small, vivid bird with a green body, a bright yellow head, and an orange-red face, it ranged across a large swath of the continent, from the Gulf of Mexico north toward the Great Lakes and west onto the Plains, occupying portions of more than two dozen states.
It was a social, loudly gregarious bird that moved in tight flocks through bottomland forest and, increasingly, through the orchards and grain fields that replaced that forest. That sociability, harmless in a wild landscape, became lethal once humans turned on the species, because a flock’s instinct to return to fallen companions made it possible to destroy nearly an entire group with sustained shooting.
Through the nineteenth century the species was killed as an agricultural pest, taken for the feather and pet trades, and squeezed by the clearing of the forests it depended on. Wild populations collapsed around the turn of the twentieth century. The last confirmed wild bird was recorded in Florida in 1904, and the last known captive, a male named Incas, died at the Cincinnati Zoo on 21 February 1918.
The parakeet’s end carried a haunting symmetry: Incas died in the same zoo, reportedly in the same aviary, that had held Martha, the last passenger pigeon, who had died there in 1914. Two North American species, both once almost unimaginably abundant, both reduced to a single named captive and then to nothing, in the same small enclosure within four years.
Steller’s sea cow (Hydrodamalis gigas) was a giant cold-water sirenian, a relative of the living manatees and dugongs, that grazed on kelp in the shallow coastal waters of the Bering Sea. Reaching lengths estimated at eight to nine meters and weights of several tonnes, it was by far the largest sirenian of recent times and one of the largest marine mammals outside the whales.
The species was made known to science in 1741, when the naturalist Georg Wilhelm Steller observed it during Vitus Bering’s expedition, after the ship wrecked and the crew was stranded on what is now Bering Island in the Commander group. By that time the animal already appears to have been a relict, confined to the waters around the Commander Islands, with a population estimated at only around 1,500 to 2,000 individuals.
Large, slow, buoyant, and seemingly unafraid of humans, the sea cow was extraordinarily easy to kill. Fur-hunting and sealing crews working the newly opened North Pacific route slaughtered it for its meat and its thick fat to provision their voyages. Within roughly 27 years of Steller’s first description, around 1768, the species was gone.
Steller’s sea cow has become the textbook example of rapid post-contact extinction: a large, conspicuous animal driven from scientific discovery to total disappearance in under three decades, documented almost entirely by the single naturalist who first described it.
The quagga (Equus quagga quagga) was a subspecies of the plains zebra native to the dry Karoo and the grasslands of South Africa’s Cape, ranging largely south of the Orange River. It was distinguished by a striking, incomplete coat: bold brown-and-white stripes on the head and neck that faded progressively down the body and dissolved into a plain reddish-brown on the hindquarters and legs, which appeared almost horse-like. Its common name, transcribed from a Khoikhoi word, was onomatopoeic, imitating its barking call, rendered as “kwa-ha-ha.”
Through the first half of the nineteenth century the quagga was hunted intensively by European settlers, principally for its meat and hide and to remove a grazing competitor with domestic sheep and goats. Because contemporary observers used the word “quagga” loosely for several kinds of zebra, the animal’s status as a distinct form was poorly understood, and its disappearance from the veld went largely unremarked at the time.
The last wild quaggas were extirpated in the late 1870s; the final wild individual is generally reckoned to have died around 1878. A handful of captive animals lingered in European zoological gardens, the last of them a mare at the Natura Artis Magistra zoo in Amsterdam, who died on 12 August 1883. No one at the time recognized that her death marked the end of the subspecies.
The quagga survives today only as roughly two dozen mounted specimens, a few skeletons, and a small set of photographs of a single living animal taken in London. It holds two distinctions in the history of extinction: in 1984 it became the first extinct animal to have its DNA studied, and since 1987 it has been the subject of the Quagga Project, a long-running attempt to breed back its distinctive coat pattern from living plains zebras.
The Pyrenean ibex (Capra pyrenaica pyrenaica), known in Spanish and Aragonese as the bucardo, was one of the subspecies of the Iberian ibex, a wild goat of the mountains of the Iberian Peninsula. It inhabited the high country of the Pyrenees in northern Spain and the far south of France, where males carried large, thick horns that curved outward, back, and up.
From the nineteenth century onward the bucardo was reduced by hunting and competition with domestic livestock until it survived only as a small remnant in and around Ordesa y Monte Perdido National Park in the Spanish Pyrenees. By 1900 fewer than a hundred remained, and from 1910 the population is reported never to have risen above forty. Across the twentieth century the numbers slid steadily downward, to a handful and finally to a single animal.
That last individual, a female named Celia, was captured and radio-collared in 1999 so that biologists could monitor her. On 6 January 2000 she was found dead, crushed beneath a fallen tree. With her death the subspecies became extinct — but, unusually, her cells had been preserved.
In 2003 a team of Spanish and French scientists used those cells to clone Celia, and a cloned kid was born alive on 30 July 2003. It died within minutes from a lung defect. The bucardo thus became the first extinct animal brought back, however briefly, through cloning — and the only one to have gone extinct twice.
The heath hen (Tympanuchus cupido cupido) was an eastern subspecies of the greater prairie-chicken, a ground-dwelling grouse of the scrubby coastal heathlands of the northeastern United States. In colonial times it ranged across barrens from southern New England to the mid-Atlantic and was so plentiful, and so cheap, that it carried the reputation of poor man’s food. A frequently repeated anecdote holds that servants in some households bargained not to be served heath hen more than a few days a week.
That abundance proved no defense. As a large, edible, ground-nesting bird that gathered in the open to display, the heath hen was easy to shoot and easy to find. Market hunting for cheap meat, combined with the steady conversion and degradation of its heathland habitat, drove it off the mainland over the course of the nineteenth century. By the latter part of that century the only survivors clung to a single island.
On Martha’s Vineyard, off the coast of Massachusetts, a remnant population persisted and eventually became the focus of one of the earliest deliberate efforts to save a North American bird from extinction. A reserve was established in 1908, and for a time the recovery looked real, with numbers climbing into the thousands.
Then a cascade of misfortunes, a catastrophic fire, a hard winter, an influx of predators, disease, and the genetic frailty of a small inbred population, undid the gains. The species dwindled to a handful, then to a single displaying male. Its end, watched and recorded as it happened, made the heath hen one of the first extinctions documented in real time and an early lesson in the perils of small-population biology.