Question

Why are venomous frogs mostly attractive and colourful?

Answer 1

Answer:

Birds have the most advanced visual abilities of all potential frog predators, so biologists believe that the myriad color varieties that frogs have developed are largely in response to the threat of avian predation. Many poisonous frogs are not lethal if eaten, but will make a predator extremely sick for some

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Answer 2

Poison dart frogs often have brightly colored bodies to warn predators of their toxicity, which is an example of aposematic signalling. ... Thus, the most dangerous species are very brightly colored, whereas species with little to no toxicity are cryptic in order to blend in with their environment and hide from predators.