This is a pretty common sight around here.
Any small animal stirred up out of the grass by this calf has to run a gauntlet of cattle egrets who are eagerly awaiting just such an event. The two on the calf's right seem especially focused, but I think we have a daydreamer (he's probably blogging this in his head) on the lower right.
Cattle egrets arrived in Florida in the late 1940's and they seem to have arrived in the Americas on their own from the Old World.
They seem to be a very adaptable bird, and hence, very successful at colonizing new turf.
Their habit of eating migrating warblers might freak out some of the aficionados of LGB's, but that sounds like an isolated unique situation according to the Cornell site.
Of course, there are a LOT of these guys, so it may be tough to be a tired, migrating warbler who decides to rest out at Fort Jefferson ...
... Sort of a Bates Motel for birds.