Shark Week: Highlight on Backcountry Sharks in the Florda Keys NWRs. The video shows a young lemon shark circumnavigating the edges of a mangrove island, surrounded by an abundance of baitfish that serve as prey for larger fish and wading birds. The shallow waters of Key West and Great White Heron NWRs provide valuable "nursery areas" for juvenile sharks like lemons, nurse, and blacktip and small sharks like bonnethead and Atlantic sharpnose. These smaller sharks find protection in these shallow