MIAMI (WSVN) - Brickell Key residents have been advised to be aware of their surroundings after an unknown reptile was spotted swimming in Biscayne Bay.

A letter went out to residents Thursday letting them know that what is believed to be a crocodile or an alligator was seen swimming in the area.

The reptile was spotted in the waters off Brickell Bay Drive, Wednesday.

Wildlife experts believe the reptile is an alligator.

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