生命之源 - Season 1 Episode 7
预告片 | HD | 583:14 分钟 | animals, nature, nature documentary
这一集的重点是那些合作和依赖(或剥削)他人的物种。叶猴从一棵树走到另一棵树,花斑鹿跟着它们,吃从树上掉下来的叶子。作为回报,当灵长类动物在地上觅食时,鹿就充当了望者。在水下,一只寄居蟹为了保护自己免受章鱼的攻击,把海葵加到它的壳里,虾虎鱼帮助一只几乎失明的虾。跳蚤、虱子和螨虫都是寄生虫:它们没有共同的伙伴关系,而是利用生物获取食物或住所。然而,寄生虫也有它们的捕食者,例如Galápagos群岛上的雀类,它们会清除巨型乌龟身上的蜱虫,牛椋鸟也会清除非洲长颈鹿身上的蜱虫(甚至用它们的皮毛来筑巢)。有些鱼经常清洁其他的鱼,濑鱼和虾似乎是这方面的专家,鮣鱼也是,它们会永久地依附在宿主身上。一种生长在宿主体内的寄生虫是吸虫,还有一种是在蜗牛体内孕育的,它之前在不知情的情况下被吃掉了。因为它需要转移到鸟的内脏才能进一步发育,所以它会让蜗牛宣传自己的存在,让自己被吃掉,从而完成这个循环。然而,有些微生物住在大型食草动物的胃里,是为了分解它们饮食中的纤维素,从而帮助它们消化。
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