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.  ?? 

4 comments:

  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.

    https://en.wikipedia.org/wiki/Cnemidophorus_arubensis

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

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    Replies
    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."

      https://academy.allaboutbirds.org/how-birds-make-colorful-feathers/

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  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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