I guess depending upon where you live if this was real in the sense of a two legged animal. My thoughts were a kangaroo if in Australia. But in North America maybe a ostrich, emo, or that other huge bird?!?
I don’t know if Florida has any of these large birds?!?
Given the poor quality of the video and short clip. It does appear to be a two legged animal. Even if we say this was in Australia it couldn’t be a kangaroo as they don’t move like that.
Now, if they said it was one of those large birds I’d believe it. Because they can run incredibly fast!