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Can Burmese Pythons swim from the Everglades to the Florida Keys?

A number of Burmese pythons have been found on Key Largo, and a few in the Lower Keys. Because pythons regularly escape or are released from captivity, it can be difficult to determine whether a snake encountered in the Keys arrived there by swimming from the mainland or was a former captive pet on the island. Given the python’s ability to disperse via salt water, expansion into neighboring islands is a concern. However, there is now evidence of an established population of Burmese pythons on Key Largo.