Wildlife biologist Joe Wasilewski has hauled many scaly creatures out of South Florida lakes, canals and marshes over the years.But the snappish four-footer he snared at the Redland Fruit & Spice Park was an unsettling surprise. It was a young crocodile, but not the typically timid native species. This was a Nile croc, infamous for its appetite for humans and savage attacks on wildebeest and other large animals along African rivers and watering holes.