It is not always easy to distinguish the Lesser Yellowlegs from the Greater Yellowlegs, which also occurs in Florida.
However, the Greater Yellowlegs has a longer bill (noticeably longer than the head) than the Lesser Yellowlegs (the bill is as long as the head).

Immokalee area, Florida, USA, 23 November 2012

2nd photo: together with a Greater Yellowlegs (behind)