Large Amphibian 2

Amphibians are cold-blooded vertebrates that evolved from fish. In the Devonian Period (419.2 to 358.9 mya), the first amphibians crawled from the muck and breathed air through lungs. Amphibians lay eggs that hatch in water. Juveniles breathe oxygen through gills. As they mature, amphibians breathe through lungs and are able to live on land. Today’s amphibians include frogs, toads, and salamanders.

Reptiles are cold-blooded vertebrates that evolved after the first amphibians. Reptiles became common in the Permian Period (298.9 to 252.17 mya). These creatures lay eggs on land and breathe air through lungs their entire lives. Modern reptiles include crocodiles, snakes, and turtles. All lizards are reptiles, but not all reptiles are lizards.

I found this piece of heavy chert on my Lake Michigan beach in southeastern Wisconsin. It is a skull of a Paleozoic beast. Because of an absence of large teeth along its jaw, I believe it to be an amphibian.


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Elizabeth Fagan, Elizabeth Fagan, Elizabeth Fagan, Elizabeth Fagan, Elizabeth Fagan, Lake Michigans Left Coast, Elizabeth G Fagan, Lake Michigans Left Coast, Elizabeth G Fagan, Lake Michigans Left Coast, Elizabeth G Fagan, Lake Michigans Left Coast, Elizabeth G Fagan, Lake Michigans Left Coast, Elizabeth G Fagan, Elizabeth Grace Fagan, Elizabeth Grace Fagan, Elizabeth Grace Fagan, Elizabeth Grace Fagan, Elizabeth Grace Fagan

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