ナショナルジオグラフィックのインスタグラム(natgeo) - 11月5日 06時00分

Video by @Joel Sartore | No, you’re not seeing double. This plains garter snake does, in fact, have two heads. A rare sight in nature, two-headed snakes are the product of a mutation that occurs during reproduction. The condition, known as bicephaly, happens when there is an incomplete splitting of an embryo. Video taken at the Herpetology Labs at the University of Nebraska-Lincoln. To see more species featured in the Photo Ark, follow me @Joel Sartore. #PhotoArk

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