25 June 2021

A blue frog and a blue lizard

The frog appears to be Cruziohyla craspedopus, which a Google Image search shows as being either bluish or greenish (via).  The lizard is described at its via as being a collared lizard.

Blue is a very unusual pigment in the animal kingdom; AFAIK, most blues are the result of structural alterations rather than pigments.  These photos could be somewhat manipulated, or perhaps the specimens are variant morphs of their species.  ?? 


  1. Blue is a very unusual color in the animal kingdom

    Plenty of blue birds though. Blue-Jay, Painted Bunting, macaws.

    And on Aruba, there are cute blue lizards as well.


    I am not convinced that blue is a rare color in nature. Plenty of blue birds, flowers, fruits, butterflies, lizards and dragon flies.

    1. I am afraid I phrased that badly. I didn't mean to say that the color blue is rare in nature, but that the pigment blue is relatively rare. Blue colors typically come from structure, not pigment, including in birds -
      "Not all structural colors are iridescent. Tiny air pockets in the barbs of feathers can scatter incoming light, resulting in a specific, non-iridescent color. Blue colors in feathers are almost always produced in this manner. Examples include the blue feathers of bluebirds, Indigo Buntings, Blue Jays and Steller’s Jays."


  2. Sooo, out of curiousity, I looked them up. As you said I think the frog image was manipulated a bit, more of a blue green in what I saw. The lizard seems to be quite a blue color! Pretty either way. Though I wonder if the color serves as a warning or camouflage?


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