Why is the head and neck of a vulture featherless?
Answer
To maintain hygiene while feeding, as feathers would otherwise collect matted gore and bacteria.
The featherless head and neck are a direct physiological adaptation to the vulture's carrion-based diet. When feeding, vultures often submerge their heads deep into the carcass. If they possessed feathers on their heads and necks, these would inevitably become matted with blood, tissue, and decaying fluids. This contamination would not only harbor harmful bacteria and parasites but would also impede effective heat loss. Bare skin is easier to clean via rain or sun, and it also helps sanitize the surface of the skin through the absorption of solar radiation.
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