Question

Why do frogs roll in and out?

Answer 1

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All prey gets swallowed whole, because frogs can't chew. ... Some frogs catch insects with a long sticky tongue. It takes less than a second for a frog's tongue to roll out, adhere to prey, and rollback into the frog's mouth.
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Answer 2

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frog's two front legs have four toes each, while the back legs have five toes each. Aquatic frogs are likely to have long, strong legs with webbed back feet to help them swim. Frogs that live on land tend to have shorter legs for walking and climbing. Tree frogs have large, round toe pads that help them cling to branches. These toe pads work like suction cups to help the frog cling on to wet leaves and other smooth surfaces.
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The Costa Rican flying tree frog soars from branch to branch with the help of its feet. Webbing between the frog's toes puffs up with air like a parachute, holding the frog aloft as it sails from tree to tree.

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