蜘蛛,它有八条腿,是一种益虫,主要吃蚊子等昆虫,多生活在屋檐下和草木丛中。它最大的特点是肛门尖端突起,能分泌黏液,这种黏液一遇到空气即可凝成很细的丝,所以只要有它的地方就会有蜘蛛网。那蜘蛛又是怎样利用网来进食的呢?我为了更好地了解这个过程,就捉了一只蜘蛛养在鱼缸里观察。刚开始它静静地躺在鱼缸里一动不动,一直到第二天放学回家,我惊奇地发现鱼缸的一角出现了一张小小的网,蜘蛛悠闲地躺 Spider, which has eight legs, is a beneficial insect, mainly eat insects such as mosquitoes, live in the eaves and vegetation. Its biggest feature is the prominent anal anus, can secrete mucus, this mucus can be condensed into a very thin silk air, so long as there will be cobwebs. How did the spider use the net to feed? To get a better understanding of the process, I caught a spider in the aquarium and observed it. At first, it lay quietly in the aquarium motionless, until the next day after school, I was surprised to find a corner of the aquarium there was a small net, the spider lying fallow