Ruggero Morimando wrote:I've no idea about the species: I've a big beautiful book about Costa Rica, but no time at the moment.
But I have an hint: I think the latter one could be an albino specimen of an otherwise more usual species... don't you think about this possibility?
David Broek wrote:The first picture is Pristimantis ridens.
The other pictures are Hypsiboas rufitelus. The reason the frog is relatively white is not albinism but simply because they have this coloration only during daytime. At night they get more greenish and more stunning in general. This shows perfectly the problem with the book you are referring to (and many other fieldguides), species are too variable to capture in one image. For identifying amphibians in my opinion 'Amphibians of Costa Rica' by Twan Leenders is way more usefull with better images and diagnostic characteristics described.
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