12 Silky Spiderwebs-Low

Silky Spiderwebs FOCUS Question How do spiders use webs to survive?

柔滑的蜘蛛网焦点问题蜘蛛是如何利用蜘蛛网生存的?

Why Webs? A spider spins a web. It climbs onto the middle of the web, stretches out its eight legs, and waits. What is it waiting for? Dinner! Spiders are invertebrates, or animals without backbones. All spiders are predators that eat insects such as flies, ants, and moths. To catch their prey, spiders build webs. A web can also be a safe home for a spider and its eggs. Different kinds of spiders make different kinds of webs. Each web is perfect for helping the spider catch food in its environment.

为什么网?蜘蛛结网。 它爬到网的中间，伸出八条腿，等待着。 它在等什么?晚餐!蜘蛛是无脊椎动物，也就是没有脊椎的动物。 所有的蜘蛛都是食肉动物，以苍蝇、蚂蚁和飞蛾等昆虫为食。 为了捕捉猎物，蜘蛛会织网。 对于蜘蛛和它的卵来说，网也是一个安全的家。 不同种类的蜘蛛结不同种类的网。 每一张网都非常适合帮助蜘蛛在环境中捕捉食物。

Spider Silk Spiders build webs using a stretchy, strong material called silk They make silk. using special body parts called spinnerets. Most spiders have more than one kind of spinneret. Each kind makes a different type of silk. Strong silk holds the web together. Sticky silk traps insects. Soft silk keeps eggs safe. Wowser! Spider silk is thin but strong. It is stronger by weight than steel!

蜘蛛用一种被称为丝的有弹性的坚固材料织网。 使用特殊的身体部位吐丝器。 大多数蜘蛛都有不止一种吐丝器。 每一种都可以制成不同类型的丝绸。 结实的丝绸能把网粘在一起。 黏黏的丝能诱捕昆虫。 柔软的蚕丝可以保证鸡蛋的安全。 老古板!蜘蛛丝很细，但很结实。 它比钢还重!

Orb Webs When you imagine a spiderweb, you probably picture one with a round or spiral shape. This type of web is called an orb. Orb weaver spiders build orb webs to catch flying insects. The silk is so thin that insects cannot see it. They fly into the web and get stuck to its sticky silk. These spiders like high spots next to open spaces where lots of insects fly. They build webs in trees, bushes, and tall grass, especially near water. Yellow garden spiders and golden orb weavers are two kinds of spiders that make these round webs.

当你想象蜘蛛网时，你可能会想到一个圆形或螺旋形的蜘蛛网。 这种类型的网被称为球体。 织网蜘蛛织网是为了捕捉飞虫。 丝很薄，昆虫看不见。 它们飞进网里，粘在黏糊糊的丝上。 这些蜘蛛喜欢靠近开阔空间的高处，那里有很多昆虫飞舞。 它们在树、灌木和高草上织网，尤其是在水边。 黄花园蜘蛛和金球编织蜘蛛是两种会织这种圆网的蜘蛛。

Building an Orb Web An orb weaver spider finds a high, open space and lets out a light silk thread Wind carries the silk thread downwind. The silk thread catches on a branch. The spider walks across it and lets out a longer thread that forms a U-shape. The spider attaches a thread from the bottom of the U to another branch. The spider adds more silk threads to finish the frame of the web. The spider moves to the center of the web and builds a spiral shape of sticky silk. The spider may make a "decoration" in the center where it waits for its next meal.

一只织网蜘蛛找到了一个高而开阔的地方，放出了一根轻丝线。风把丝线带到了下风。 丝线挂在树枝上了。 蜘蛛走过它，放出一根更长的线，形成一个u形。 蜘蛛从U的底部将一根线连接到另一根树枝上。 蜘蛛增加了更多的丝线来完成网的框架。 蜘蛛移动到网的中心，用黏黏的丝做成螺旋形。 蜘蛛可能会在中间做一个“装饰”，在那里等待它的下一餐。

Funnels and Tunnels Some spiders build funnel-shaped webs. This kind of web is great for catching crawling insects such as ants. The wide end of the funnel spreads out to form a flat open "floor." The spider hides in the narrow tube. Special threads stretch from the floor to the spider's hiding spot. The threads are not sticky, so they can't trap an insect. Instead, when an insect steps on these threads, the spider feels it. Quick as a flash, it grabs the insect. Look for funnel webs in low spots, such as dense grass, fallen leaves, or piles of stones.

漏斗和隧道有些蜘蛛会织漏斗状的网。 这种网非常适合捕捉爬行昆虫，比如蚂蚁。 漏斗宽的一端展开形成一个平坦开放的“地板”。 蜘蛛躲在狭窄的管子里。 特殊的线从地板延伸到蜘蛛的藏身之处。 这些线不粘，所以不能困住昆虫。 相反，当昆虫踩到这些线时，蜘蛛会感觉到。 它像闪电一样迅速抓住了昆虫。 在低矮的地方寻找漏斗网，比如茂密的草地、落叶或成堆的石头。