Lesser Yellow-headed Vulture

Cathartes burrovianus

Cathartes burrovianus is a species of bird in the New World Vulture family Cathartidae. It is found in Mexico, Central America, and South America in seasonally wet or flooded lowland grassland, swamps, and heavily degraded former forest.
Lesser Yellow-headed Vulture (Cathartes burrovianus) Santa María de Fátima, Loreto, Peru. Nov 21, 2022 Cathartes burrovianus,Geotagged,Lesser Yellow-headed Vulture,Peru,Spring

Appearance

The Lesser Yellow-headed Vulture is 53–66 cm in length, with a wingspan of 150–165 cm and a tail length of 19–24 cm. Its weight ranges from 0.95 to 1.55 kg. Its plumage is black with a green sheen. The throat and the sides of the head are featherless. The head and neck are bare of feathers, and the skin is yellow, with a reddish forehead and nape and a gray-blue crown. The irises of its eyes are red, its legs are white, and its beak is flesh-colored. The eye has a single incomplete row of eyelashes on the upper lid and two rows on the lower lid....snipped...
The tail is rounded and relatively short for a vulture; the tip of the closed wing extends beyond the tail. Immature Lesser Yellow-headed Vultures have browner plumage, a dusky head, and a white nape.

The beak is thick, rounded, and hooked at the tip.
The front toes are long with small webs at their bases and are not adapted to grasping. The opening of the nostril is longitudinal, and the nostrils lack a septum. Like all New World Vultures, the Lesser Yellow-headed Vulture lacks a syrinx, and is therefore unable to make any sound other than a low hiss.

It differs in appearance from the similar Greater Yellow-headed Vulture in several ways. It is smaller than the Greater Yellow-headed Vulture and has a shorter, thinner tail. The plumage is browner than the Greater Yellow-headed Vulture's dark, glossy black plumage. Its legs are lighter in color, and its head is more orange-tinged than the more yellow head of the Greater Yellow-headed Vulture. Its flight is also less steady than that of the Greater Yellow-headed Vulture. The Lesser Yellow-headed Vulture also prefers to live in savannas, as opposed to the preferred forest habitat of the Greater Yellow-headed Vulture, and is less heavily built.

Besides the Greater Yellow-headed Vulture, it is similar to the Turkey Vulture....snipped...
Cathartes burroviannus  Cathartes burrovianus,Lesser Yellow-headed Vulture

Naming

It was considered to be the same species as the Greater Yellow-headed Vulture until they were split in 1964.
Lesser Yellow-headed Vulture in flight, Uraba, Colombia Also called the "Savannah vulture". Flies in a V-shape as shown here. Detects food based on smell, and therefore flies relatively low. Antioquia,Cathartes burrovianus,Colombia,Colombia Choco & Pacific region,Lesser Yellow-headed Vulture,South America,Uraba,Urabá,World

Distribution

It is found in Argentina, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname, Uruguay, and Venezuela.
Its natural habitats are subtropical or tropical seasonally wet or flooded lowland grassland, swamps, mangroves, and heavily degraded former forest. It may wander over dry fields and clearings. It is not generally found in high-altitude regions.
Lesser Yellow-headed Vulture - Cathartes burrovianus Seen in Pairi Daiza, Sep 2016. Belgium,Cathartes burrovianus,Geotagged,Lesser Yellow-headed Vulture,Summer

Status

The Lesser Yellow-headed Vulture is a bird of Least Concern according to the IUCN, with an estimated global range of 7,800,000 square kilometers and a population of between 100,000 and 1,000,000 individuals. Its population trend appears to be stable.
Lesser Yellow-headed Vulture (Cathartes burrovianus) A lesser Yellow-headed surveys the river side of the Amazon, only coming down to scavenge or to lay eggs. Amazon,Birds,Brazil,Cathartes burrovianus,Geotagged,Lesser Yellow-headed Vulture,Vulture

Behavior

The Lesser Yellow-headed Vulture flies solitarily, with wings held in a dihedral position. It glides at a low altitude over wetlands while locating food, and perches on fence posts or on other low perches. When flying, it travels alone and is rarely found in groups. The flight of the lesser Yellow-Headed is an example of static soaring flight, which uses thermals to maintain altitude without the need to flap its wings. This vulture rarely soars high in the air, preferring low altitudes....snipped... This bird is believed to be somewhat migratory in response to the changes in water level where it lives. The Lesser Yellow-headed Vulture, like other New World Vultures, has the unusual habit of urohidrosis, in which it urinates or defecates on its legs to cool them by evaporation.
Amazon Grim Reaper Death in the Amazon does not go unnoticed by this Lesser Yellow-headed Vulture, sometimes called "Savannah Vulture". Amazon,Brazil,Cathartes burrovianus,Geotagged,Lesser Yellow-headed Vulture,Vulture,birds

Habitat

It is found in Argentina, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname, Uruguay, and Venezuela.
Its natural habitats are subtropical or tropical seasonally wet or flooded lowland grassland, swamps, mangroves, and heavily degraded former forest. It may wander over dry fields and clearings. It is not generally found in high-altitude regions.The Lesser Yellow-headed Vulture flies solitarily, with wings held in a dihedral position. It glides at a low altitude over wetlands while locating food, and perches on fence posts or on other low perches. When flying, it travels alone and is rarely found in groups. The flight of the lesser Yellow-Headed is an example of static soaring flight, which uses thermals to maintain altitude without the need to flap its wings. This vulture rarely soars high in the air, preferring low altitudes....snipped... This bird is believed to be somewhat migratory in response to the changes in water level where it lives. The Lesser Yellow-headed Vulture, like other New World Vultures, has the unusual habit of urohidrosis, in which it urinates or defecates on its legs to cool them by evaporation.
Lesser Yellow-headed Vulture (Cathartes burrovianus) Vultures like this are typically found along the Amazon riverside in areas where there is less vegetation. Amazon,Brazil,Cathartes burrovianus,Geotagged,Lesser Yellow-headed Vulture,Vulture,birds

Reproduction

Lesser Yellow-headed Vultures do not build nests, but rather lay eggs on the ground, cliff ledges, the floors of caves, or in the hollow of a tree. Eggs are cream colored and heavily blotched with brown and gray spots, particularly around the larger end. Two eggs are generally laid. The chicks are altricial—they are blind, naked and relatively immobile upon hatching. The chicks do not grow their down feathers until later. The parents feed their young by regurgitating pre-digested food into their beak, where the chicks then drink it. Young fledge after two to three months.

Food

The Lesser Yellow-headed Vulture is a scavenger and subsists almost entirely on carrion. It will eat roadkill or the carcass of any animal, but is also known to hunt for food, especially small aquatic animals in marshes. It prefers fresh meat, but often cannot make the first cut into the carcass of a larger animal because its beak is not strong enough to tear into the tough hide. The Lesser Yellow-headed Vulture will no longer feed on a piece of carrion once the meat is in a state of extreme decay, as it becomes contaminated with microbial toxins. Like other vultures, it plays an important role in its ecosystem by disposing of carrion which would otherwise be a breeding ground for disease.

The Lesser Yellow-headed Vulture forages using its keen eyesight to locate carrion on the ground, but also uses its sense of smell, an ability which is uncommon in the avian world. It locates carrion by detecting the scent of ethyl mercaptan, a gas produced by the beginnings of decay in dead animals.
The olfactory lobe of its brain responsible for processing smells is particularly large compared to other animals. This characteristic of New World Vultures has been used by humans: ethyl mercaptan is injected into pipelines, and engineers looking for leaks then follow the foraging vultures.

King Vultures, which lack the ability to smell carrion, follow the Lesser Yellow-headed Vultures to carcasses, where the King Vulture tears open the skin of the dead animal. This allows the smaller Lesser Yellow-headed Vulture access to food, as it does not have a bill strong enough to tear the hide of larger animals. This is an example of mutual dependence between species. It is generally displaced from carcasses by both Turkey Vultures and King Vultures, due to their larger size.

References:

Some text fragments are auto parsed from Wikipedia.

Status: Least concern
EX EW CR EN VU NT LC
Taxonomy
KingdomAnimalia
DivisionChordata
ClassAves
OrderCathartiformes
FamilyCathartidae
GenusCathartes
SpeciesC. burrovianus