Colombian Grebe

The Colombian Grebe is one of the saddest entries in South America's bird list: a small, elegant diving bird that lived nowhere on Earth except the cold, reed-fringed wetlands of the high Eastern Andes of Colombia, and that slipped into extinction within living memory. Centered on the Bogota savanna and the shining expanse of Lake Tota, it swam and dived through Andean marshes that sat at more than 2,500 meters above sea level, a world of chilly water, floating vegetation, and open sky.

For most of its known history it was hidden in plain sight, treated as merely a local form of the widespread black-necked grebe. Only later did ornithologists recognize it as a full species in its own right, distinguished by plumage details and its complete isolation in the Colombian highlands. By the time that recognition arrived, the bird was already disappearing. Abundant at Lake Tota in the 1940s, it collapsed with shocking speed as its wetlands were drained, polluted, and stocked with introduced fish. The last confirmed sighting came in 1977, and today the Colombian Grebe survives only in museum trays and old field notes, a reminder of how quickly a specialized, range-restricted species can vanish.

The Colombian Grebe is known today only from preserved specimens, a scattering of photographs, and the field notes of the naturalists who watched it before it was gone. It was a small grebe, very similar to the black-necked grebe, and would have sat low in the water with the compact, tail-less silhouette typical of the family. In breeding dress it was a striking little bird: a blackish head and neck set off by a fan of golden ear plumes and warm chestnut flanks.

Male vs. female

As in the black-necked grebe and other members of its group, the sexes were almost certainly alike, with no reliable plumage difference that an observer could use in the field. Males may have averaged slightly larger, but this is inferred from close relatives rather than firmly documented for the Colombian Grebe itself. Both sexes would have worn the same golden ear fans and chestnut flanks in the breeding season and the same drab gray-and-white pattern in the nonbreeding months. Because the species vanished before modern study, no detailed measurements separating the sexes were ever gathered.

Juveniles

Young Colombian Grebes were never described in any detail, but they would have resembled the striped, downy chicks typical of all grebes. Newly hatched young of this group are boldly patterned in black and white or buff, with lined faces, and they famously ride tucked into the feathers of a swimming parent's back for warmth and safety. As they grew, juveniles would have molted into a dull, grayish nonbreeding-like plumage before acquiring the golden ear fans of adulthood. Sadly, the bird disappeared before biologists could document its breeding cycle, so the appearance and development of its young remain largely a matter of inference from related species.

The voice of the Colombian Grebe was poorly documented and no recordings are known to survive. As a very close relative of the black-necked grebe, it is thought to have produced similar sounds: soft, high, whistling notes and thin trills given around the marsh, especially during courtship and while defending a nesting territory. Grebes in this group are not loud, carrying birds, and much of their communication is visual, performed through head-shaking and rushing displays on the water rather than through song. Any fuller picture of what this bird actually sounded like was lost with the species itself.

The Colombian Grebe was a true endemic, found only in the freshwater wetlands of the high Eastern Andes of Colombia. Its stronghold was the Bogota savanna, a plateau of marshes and shallow lakes around the capital, together with Lake Tota in the department of Boyaca, the largest lake in the country. These sat at high elevation, generally above 2,500 meters, in a cool, montane climate.

It favored reed-fringed marshes and the open shallows of these Andean lakes, where dense stands of aquatic vegetation offered cover for nesting and rich feeding grounds. There is no evidence that it was migratory; like other high-altitude grebes it was almost certainly a year-round resident, tied for life to a very small set of wetlands. That extreme dependence on a handful of vulnerable sites left it with nowhere to go when those wetlands were transformed, and it is a large part of why the species could not survive the changes that swept through its range in the twentieth century.

Like other small grebes, the Colombian Grebe fed by diving from the surface and pursuing prey underwater, propelled by its powerful, lobed feet. Its diet is believed to have consisted mainly of small fish and aquatic invertebrates, including insect larvae and other small creatures gleaned from among the water plants and taken from open water.

Its feeding ecology is thought to have been central to its downfall. The introduction of rainbow trout to its lakes, intended to create a fishery, is widely blamed for damaging the grebe both directly and indirectly: the trout competed for the same invertebrate prey and are also thought to have eaten grebe chicks. Combined with the loss of the clear, plant-rich shallows the bird needed to hunt, this disruption of its food supply helped push an already declining species toward extinction.

The breeding habits of the Colombian Grebe were barely recorded before it vanished, and much of what can be said is inferred from its close relatives. As a typical grebe, it would have built a floating nest of waterweed and other aquatic vegetation, anchored to standing reeds or plants so that it rose and fell with the water level. Both members of a pair likely shared in building and tending the nest.

It probably laid a small clutch of pale eggs, which the parents would have covered with wet vegetation when leaving the nest, staining the shells over time. On hatching, the striped young would have climbed onto a parent's back to be carried and brooded, as grebe chicks do. Beyond this general picture, the specifics of its timing, clutch size, and success were never studied, and the chance to learn them was lost when the last birds disappeared.

The Colombian Grebe is extinct, so it can no longer be seen anywhere in the wild or in captivity. But its story is not a reason to give up on the high Andean wetlands it once called home; those same lakes and marshes still hold living grebes and a rich community of waterbirds. If you want to connect with this bird's world, the honest goal is to visit its former range thoughtfully and to seek out the relatives that survive.

• Visit Lake Tota in Boyaca, Colombia, the grebe's former stronghold, where wetland restoration and responsible tourism now matter more than ever for the birds that remain.
• Look for the Silvery Grebe, another small grebe of high Andean lakes, which can still be found on suitable wetlands in the region.
• Watch for the widespread Pied-billed Grebe and Least Grebe on Colombian ponds and lakes as accessible stand-ins for the diving-grebe lifestyle.
• Support wetland conservation groups working on the Bogota savanna, where drainage and pollution once doomed the Colombian Grebe and still threaten its former neighbors.
• Use the closely related Black-necked (Eared) Grebe, found across much of the world, to picture what the Colombian Grebe looked like in life, right down to its golden ear fans.
• Treat the site respectfully: keep to trails, avoid disturbing reed beds and nesting waterbirds, and remember that the same pressures that ended one species still weigh on the survivors.

• Black-necked Grebe: Its close relative, with the same golden ear fans; still widespread across much of the world.
• Eared Grebe: The North American name for the black-necked grebe, essentially identical in appearance.
• Silvery Grebe: Another small grebe of high Andean lakes and the best living echo of the Colombian Grebe's world.