It was a time when the killer whales, or "killers" as they were then called, helped the whalers catch the baleen whales that were on their annual migration.(在那個時期，殺人鯨，正如當時他們被稱呼的，幫助捕鯨者捕殺在每年遷移途中的須鯨。)

One group of whales has, instead of teeth, long strips of bone, hanging from their upper jaw. This is the baleen whale, the largest animal in the world.(有一類鯨魚，用從上額骨垂下來的長條狀的骨頭代替牙齒，它就是須鯨，是世界上最大的動物。)

However, the position of the eyes so restricts the field of vision in baleen whales that they probably do not have stereoscopic vision.(但是眼睛的位置如此嚴重地限制了須鯨的視野，以致于它們可能不具備立體視覺。)

Surfacing in warm winter waters off the Baja California coast, a gray whale flashes its baleen plates by a boat.(下加利福尼亞海岸(BajaCaliforniacoast)附近，在冬日溫暖的海水里，一條灰鯨浮在水面上，露出了鯨須板，旁邊是一條船。)

There is a known as the "tiger of the sea" killer whale, sometimes dozens of head formed a group, surrounded by a more than 30 tons of baleen whales, a few hours ate it up.(有一種號稱“海中之虎”的虎鯨，有時好幾十頭結成一群，圍住了一頭三十多噸重的長須鯨，幾個小時就把它吃光了。)

Each side of the upper jaw has 350-400 baleen plates.(上頜兩側各有350-400個鯨須板。)

If we want to understand the factors that led to gigantism in baleen whales, we'll need to look at fossils yet to be discovered or described.(如果我們想更進一步弄清楚導致須鯨體型巨大的緣由的話，我們還需那些尚未被發掘或還原出得化石來佐證。)

Baleen whales have been tracked by autonomous gliders before, by researchers at Woods Hole Oceanographic Institution, Massachusetts.(馬薩諸塞州的WoodsHoleOceanographic研究的研究員們以前是用自主滑翔器來跟蹤須鯨。)

Baleen traps prey when the whale expels water.(布賴德鯨通過排出水流就可以捕食獵物。)

Baleen whales, including the humpback whales and blue whales, are toothless and instead use hairlike structures called baleen to filter tiny prey such as krill from seawater.(長須鯨包括座頭鯨和藍鯨都是沒有牙齒的，它們用一種類似毛發般的細小結構——鯨須作為替代捕食方法，利用它們過濾海水中的食物，例如磷蝦。)