 Offspring were then released into the refuge, but unfortunately fell victim to predators, primarily feral cats.Crocodile Lake National Wildlife Refuge (CLWR) and Dagny Johnson Key Largo Hammock Botanical State Park (KLH) are separated by the County Road 905 right-of-way for approximately 10 miles.On April 13, 2007, two researchers were studying North Key Largo's population of Key Largo woodrats, one of two federally endangered mammals found only in North Key Largo (the other being the Key Largo cotton mouse).