Peter and Dr. Rae fight to save critically endangered sawfish off Cape Canaveral amid habitat loss, overfishing, and a mysterious infection. Peter tags wild fish; then they head to the Bahamas to study ecology and meet rare captive sawfish.
Manatees, the South's gentle giants, face climate change, habitat loss, and human threats. Peter visits the Columbus Zoo, where Stubby mothers orphan Squirrel. At Florida's Blue Spring, Dr. Rae helps release rehabilitated manatees back to the wild.