动物学家们观察到了一个非常有趣的现象：海狮和海豹都非常喜欢吞食光滑小巧的鹅卵石和海滩石。它们吞食的海滩石通常与高尔夫球的大小差不多。 但是也有一些例外现象，比如有人曾经在一只海狮的胃里发现了一块重约11公斤的大石头。海狮和海豹为什么要吞食石头呢？这是为了填饱肚子，还是出于别的动机？人们众说纷纭。有一种说法是，海狮和海豹之所以会吃石头，是调节体内的平衡，石头的重量，能降低它体内脂肪的浮性。还有一种说法是，海狮和海豹胃里的石头与鸡和鸟嗉囊里的小碎石的功能是一样的，都是用来帮助消化食物的。鸡嗉子弄够帮助弄碎橡胶一样的鱿鱼肉。持第三种看法的似乎更多一些，他们认为海狮和海豹吞石头是为了打掉肠胃里令人讨厌的寄生虫。海狮和海豹都经常受到身体里寄生虫的折磨，他们是用石头把肠胃里的寄生虫磨烂。当然，他们不会像鸟雀一样把吞下去的石头消化掉，当石头发挥作用以后，它们会把从胃里反上来的吐掉。几种说法似乎都有一定的道理，不过究竟哪一种说法是正确的的还没有最后的定论，还有待进一步研究。
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