Green and brown

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Note that the above-water portion of the frog appears to be a different color (green) from the below-water portion (brown). Does this stem from differential skin pigmentation or from different algae species living on its skin? Probably adaptive either way.

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Content
brown
color *
frog
green
Location
Bellevue Pond
Boston metropolitan area *
Massachusetts *
Middlesex Fells Reservation
lake *
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