The largest of all North American frogs, this giant can grow to a length of 8 inches or more and weigh up to 1.5 pounds. Even the tadpoles of this species can reach 6.75 inches in length.

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But big brains may be too costly to maintain when predation ... they too easily become snacks—so more camouflaged individuals end up being the top frogs despite their small size. In contrast, when ...