The four hurricanes that ravaged the state in August and September took a toll on Florida's wildlife and environment.
Scientists say they are unsure how many endangered species, such as sea turtles and red cockaded woodpeckers, still exist.
Beach mice may have been harmed more than any other species because there were so few to begin with.
Officials are trying to help the mice recover by putting out sunflower seeds for them to eat while trapping predators and urging beach residents to keep pets inside and avoid attracting roaming cats, raccoons and other animals by feeding them.
Ralph Costa heads the U.S. Fish and Wildlife Service's recovery program for red cockaded woodpeckers. He said Ivan broke or uprooted about 150 of more than 900 active cavity trees at Eglin Air Force Base and the Blackwater River State Forest.