TABLE 13-2 ADAPTIVE FEATURES OF MARINE ( AQUATIC ) BIRDS Bird Features / Structures Purpose /Function Skimmer Longer lower bill Osprey Catching fish in flight ) Penguin Swimming underwater Oystercatcher Knifelike bill Sea duck Webbed feet Sandpiper Feeding along shore Heron (egret ) Long legs and bill Albatross Long -distance flight Pelican Large pouch Commorant Fishing underwater