A white-and-black, mid-sized raptor with a deeply forked tail, swallow-tailed kites (Elanoides forficatus) are arguably the most acrobatic and athletic of birds found in the Sunshine State.

The 10-second footage, which shows a mysterious, black mammal with a hyena-like snout and a long tail, has 1.6 million views and few believers. The clip was posted to Instagram by an account named ...