Frogs are the most successful group of amphibians, over 7000 species, and ~100 new ones discovered each year! This one is the North American Green Treefrog.
Most frogs live only in fresh water, but green treefrogs have adapted to tolerate high levels of saltwater that would kill other frogs and thus can inhabit many coastal salt march ecosystems.
Frogs are such good singers that they can do so without opening their mouths! They squeeze their torso muscles which forces air through the voice box and over the fibrous vocal cords which then causes the chords to vibrate. Air is pushed simultaneously through the throat and into the vocal sac which then expands and acts just like a stereo amplifier—creating the characteristic calls we often hear on summer nights.
Green treefrogs mate in the summer and will show up to ponds by the 100s, along with several other species of frogs, all calling at once; however, females are still able to distinguish among the loud chorus, which calls are her species and within her species able to choose who is the “best” male to mate with.
Treefrogs also have extra cartilage (like the end of your nose) between the last two bones in each toe to offset the toe pad from the rest of the toe to help them stick to things!
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