they were able to separate into layers of individuals, 但还是能够分离成数层个体层
Endangered, they number fewer than 2,000 individuals. 这种生物濒临灭绝 数量不足2000只
and contains several billion individuals. 共有数十亿只蝗虫
a staggering variety of species and countless individuals are striving for space and food. 都有生命为了空间与食物斗争不已 种类繁多 数不胜数
which might help individuals to avoid a fight. 或许可以避免个体之间的争斗
There are more than 7,000 individuals on Fernandina alone. 仅在费尔南迪纳岛上 就有超过七千只海鬣蜥
Individuals link together to form chains which can stretch for fifteen meters. 这些一个个单体组成的链条可长达15米
but so far only eight individuals here have mastered this daring technique. 不远处有8只海豚在展示这种高超的技术
fewer more successful than the ants. There can be 8 million individuals in a single hectare. 蚂蚁是雨林昆虫中的佼佼者 每公顷可达800万只