Studies show that trash near drilling rigs attracts gulls that prey on other species .
研究表明，在钻探设备附近的废弃物吸引了鸥来捕食其他物种。
Sometimes , rather than letting clams drop to the ground , herring gulls try to catch the clam in mid-air .
有时，与让蛤掉在地上相比，银鸥更喜欢试图在半空抓捕蛤。
Other shorebirds play this game of catch as well , including black-backed gulls , common gulls , and pacific gulls .
其他水鸟也会玩儿这种抓捕游戏，包括黑背鸥，常见的海鸥和太平洋海鸥。
Herring gulls ( larus argentatus ) , too , like to play , but it 's not them that take any risks .
银鸥（成年的鲭鸥）也很喜欢玩儿，但是这不是它们的任何冒险行为。
The ice 's edge is therefore rich in micro-organisms , crustaceans and everything that feeds on them : polar cod , ringed seals , polar bears , ivory gulls and so on .
