塔兰托毒蛛与点状蜂蛙

Lesserblack Tarantula and Dotted Humming Frog

一种名为“塔兰托毒蛛”的狼蛛生活在地下的洞穴中。它与一种名为“点状蜂蛙”的小型青蛙是朋友。有时,蜘蛛会抓住青蛙,把它们检查一番,又放它们离开。蜘蛛本可以轻易吃掉青蛙,但它并没有。事实上,蜘蛛还会让青蛙住进它的洞穴。那么蜘蛛为什么要邀请青蛙进洞呢?

A spider called lesserblack tarantula lives in burrows(洞穴)in the ground.It is friends with a type of small frog called dotted humming frog.Sometimes a spider will grab(抓住)a frog,examine(检查)it,then let it go.The spider can easily eat the frog,but it doesn't.In fact,the spider lets the frog live in its burrow.Why does the spider invite the frog into its burrow?