Some of them are orb weaving spiders and some of them are non orb weaving spiders.

When you look at this orb web, you're actually seeing many types of silk fibers.

JULlET O, swear not by the moon, the inconstant moon, That monthly changes in her circled orb,

There's the aggregate and flagelliform silk glands which combine to make the sticky capture spiral of an orb web.

This is the silk that's used to make the frame and radii of an orb web, and also the safety trailing dragline.

And He it is Who hath created the night and the day, and the sun and the moon, each in an orb floating.

In an orb web weaving spider, you can find seven types of silk glands, and what I have depicted here in this picture,

It's been hypothesized that orb weaving spiders, like this argiope here, should have the toughest dragline silks because they must intercept flying prey.

In fact, the toughest dragline in this survey is this one right here in this white region, a non orb web weaving spider.

The 21 species are indicated here by this phylogeny, this evolutionary tree, that shows their genetic relationships, and I've colored in yellow the orb web weaving spiders.

So if you ever have the opportunity to dissect an orb web weaving spider, and I hope you do, what you would find is a bounty of beautiful, translucent silk glands.

With him dwelt Fenda, his hospitable wife, who told fortunes, yet pleasantly large, round, and black, blacker than any of the children of night, such a dusky orb as never rose on Concord before or since.