One genus of storks, the adjutant bird (Leptoptilos), includes members with featherless heads and necks. Why have these birds selectively lost these feathers?

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Ecological adaptations

An ecological adaptation is any morphological, physiological, or behavioral trait of an organism that allows it to survive and reproduce in a habitat or ecosystem. Adaptation is a biological mechanism by which an organism gradually gets more acclimated to its surroundings.