Amphibians can leave a bad taste in your mouth...
In the case of the grey tree frog (Hyla versicolor), colour is used to mimic the bark of lichen-covered trees, effectively hiding it from hungry eyes. By contrast, the poison dart frogs of South America use colour to attract attention and convey a message of warning: "eat me and die!" Similarly, the red eft of the red spotted newt (Notophthalmus viridescens) is named for its conspicuous colour which warns potential predators of the poison it can secrete from glands in its skin.
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