(I'm not sure if this is a bug or not but I wanted to mention it anyway.)
Squids can swim up to the surface edge of a block. If they keep swimming at the edge on the correct angle, they can wide up on top of the block out of the water.
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However, this issue is a Duplicate of MC-132473.
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Dolphins can also bounce around on land. usually when going thru a thin point joining sea to river, they miss and go over the land instead.