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Vultures eat dead things, may stick their heads right inside the gut of a dead animal. Such habits give the risk of having of having the feather soiled with bacteria producing guck. To promote better health a nake head is better as it is more easily cleaned.
Vultures have bald heads and necks to regulate their body tempreture. They must cope with the large variation in tempreture in the environment they live in. Read more here : (See related Link)
fighting or the annual molting of feathers.
Feathers that are on the neck of a bird.
ring-necked dove
Why would a canary lose the feathers around his neck?
Quetzalcoatl
Wood Storks have white feathers and on the edge of their wings their feathers are black. Their neck and head are gray
Brolgas are light silvery-grey in colour, with dark legs. They have a scarlet band on the back of their head and neck.
Most likely so that blood and flesh from the carcass doesn't stick and build up on the head and neck.
A giraffe no dought. also have you heard about the long neck dinosaur. Birds have feathers too hopefully you are a kid if you are asking this question.
Budgies can't pull out feathers that they can't reach with their beaks. If a bird is losing feathers on its head or neck, the problem is not plucking (unless a cagemate is responsible for the plucking). Bald spots are not normal for budgies, even elderly ones. You should consult an avian veterinarian.