The sounds "umph, umph, umph" might not resonate with you, but for baby crocodiles still in their shells, they are telling mom, "Let us out!"
Biologists have known that shortly before hatching, crocodiles make noises within their eggs. A new study, which involved playbacks of the pre-hatching calls, reveals these calls from the egg tell siblings it’s time to hatch and tell moms it’s time to uncover the nest.
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