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How many species of king cobras are there?

The King Cobra is thought of as a single wide spread species, but a recent paper published in MPE suggests it is at least four species.
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The western edge of Ornate Box Turtle’s distribution in Arizona

The Ornate Box Turtle is at the western edge of its range in Pima County, Arizona
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The ancestor for the Squamata + Rhynchocephalia

A new fossil suggests it may be the ancestor to the tuatara, lizards and snakes











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