Some sharks remain on the move for their entire lives. This forces water over their gills, delivering oxygen to the blood stream. If the shark stops moving then it will suffocate and die.

Frog-eating bats identify edible frogs from poisonous ones by listening to the mating calls of male frogs. Frogs counter this by hiding and using short, difficult to locate calls.

Dill seeds are so small that approximately 10,000 dill seeds would be required to make an ounce.

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