cottonmouth images - Joel Sartore

A Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station.

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A Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station.

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A western cottonmouth (Agkistrodon piscivorous) snake lies dead on the Clear Creek Levy Road, near Ware, Illinois. Road kills are one of the leading causes of death for snakes in the U.S.

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A western cottonmouth snake (Agkistrodon piscivorous) lies on the Snake Road, near Ware, Illinois. This three mile stretch of road along the is closed to traffic when the snakes are migrating from limestone cliffs to the swamp nearby.

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A cottonmouth snake (Agkistrodon piscivorus) at the Houston Zoo, Houston, Texas.

A juvenile Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station. This animal was collected near Arcadia, Florida, in De Soto County.

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A juvenile Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station. This animal was collected near Arcadia, Florida, in De Soto County.

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A juvenile Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station. This animal was collected near Arcadia, Florida, in De Soto County.

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A juvenile Florida cottonmouth (Agkistrodon piscivorus conanti) at the Archbold Biological Station. This animal was collected near Arcadia, Florida, in De Soto County.