Why do many vulture species possess a lack of feathers on their heads and necks?
Answer
To prevent pathogens from accumulating when feeding on carcasses
The lack of feathers on the head and neck is an adaptation for hygiene. When a vulture feeds by plunging its head into a carcass, feathered skin would become matted with blood, tissue, and bacteria, creating a breeding ground for pathogens that would be difficult to clean. Bare skin prevents this accumulation and allows the skin to be sterilized by the sun's ultraviolet rays.
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