Besides being vivid red, what feature is often characteristic of the irises of this species' large eyes?

Answer

A vertical pupil

Their large, bulbous eyes possess incredibly vivid red irises, often accompanied by a vertical pupil, which is a hallmark of the species.

Besides being vivid red, what feature is often characteristic of the irises of this species' large eyes?

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Red Eyed Tree Frog - Amazing Facts 1 - YouTube

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