"Reel McKoi" wrote:

Why are all the pretty colorful frogs tropical? All our frogs here are some
shade of green, brown or gray.

Nature usually favors creatures that blend in with their surroundings so
that predators can't find them or those that taste horrible so predators
won't want to find them. So many of those frogs that evolved with
colorful surroundings became colorful. The others didn't have any
evolutionary pressure to do so. So the observation is that it seems
that tropical surroundings are more colorful and I believe that is
correct. Also, they are more colorful all year long.
--
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA