Shoebills are usually silent, but will often participate in bill-clattering, a behavior characteristic of true storks. Adults will often do this when greeting each other at the nest, but young shoebills also perform the bill-clatter. Adults will also make a whining or "mooing" noise and young will make a hiccupping noise especially when begging for food.The shoebill is a solitary species and is never found in groups. Only when food is in short supply will shoebills forage near each other.
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University of Michigan Museum of Zoology