Feral and free-ranging cats have been identified as a major factor in the significant decline of the Key Largo woodrat and the Key Largo cotton mouse. Recent remote camera work has identified cats throughout the refuge and KLH, with some perched on top of nest structures. Cats have been returned that are 8 miles from their owner's homes. Cats are captured by staff and volunteers and turned over to the local animal shelter. The owners of cats that continually trespass may be subject to fines.