What physical feature helps penguins secure slippery prey like fish while swallowing underwater?

Answer

Backward-facing papillae on the tongue and mouth roof

Penguins possess backward-facing spines, known as papillae, on their tongues and the roof of their mouths. These structures act like barbs to secure the meal and ensure it travels down the throat.

What physical feature helps penguins secure slippery prey like fish while swallowing underwater?
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