Forming a defensive ring around their calves, the adults present a barricade that few hunters could breach. 成牛围成圈以保护它们的小牛, 一般的猎食动物很难突破这层封锁
the winged adults release pheromones - scent messages, 长着翅膀的成虫便释放出信息素 即一些气味信号
Normally it takes four weeks for hoppers to become adults, 一般说来 若虫需要 经过4周才能变成成虫
Only the adults have the speed and agility needed to make a catch. 只有成年水獭才具备 捕鱼所需的速度和灵巧
Adults share their catches with their squabbling cubs. 成年水獭把“战利品”与幼崽一起分享 小家伙们立刻抢成一团