Antarctic Leopard Seal (image) NOAA Fisheries West Coast Region Share Print E-Mail Caption Antarctic leopard seals prey on penguins and fur seals, which feed on shrimp-like crustaceans called krill. Scientists monitor the seals as useful barometers of the health of the Antarctic ecosystem. Credit NOAA Fisheries/Southwest Fisheries Science Center Usage Restrictions CREDIT: NOAA Fisheries/Southwest Fisheries Science Center Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.