Despite their small size, they are very aggressive when defending their nests and will take on larger birds like raptors. 

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Starfish are carnivores and eat critters like clams, oysters, and mussels. And clams can flee predators. 

Sea angels are one of the smallest and vicious marines animals at under 5cm

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Blue Banded Bees Are Antisocial

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The American Bittern

A Tufted Titmouse is a small songbird with a crest of feathers on its head