hawks in an oak tree
A pair flying overhead
Round, flat, green, approximately size of palm of hand (3-4 inches). Hair like features on the back. 5 "slots' in the shape of a circle visible on both sides.
Found approximately 55 feet off of beach in Indian Rocks Beach, FL. Was sitting on top of sand under water. Brought to beach for pictures and placed back where found.
Phylum Echinodermata, class Echinoidea identifying characteristics: flat, round, no arms or legs, has "hairs" which are part of spine on back if alive, slow moving on top of sand surface.
Reference: http://www.seashells.org/sanddollars.html