The term 'fish-eating wader' refers to two species of birds, the EGRET and the IBIS. The EGRET is a large white bird with long legs and a long neck, while the IBIS is a medium-sized bird with a curved bill. Both species feed on fish, crustaceans, and other aquatic animals, and are found in wetlands and near bodies of water. They are both important members of the ecosystem, helping to keep the water clean by eating small fish and other aquatic organisms.