Look around many homes and businesses today, and you'll see recycling bins full of paper, metal cans, and plastic.
In a world of limited resources, it makes sense to reduce, reuse, and recycle as much as possible. That's why humans aren't the first to try to conserve natural resources by recycling. Spiders have their own program to recycle valuable protein.
The spiders we're talking about are the orb-weavers, the ones that make those rounded, intricate webs you see shimmering between branches in a garden or forest. To increase their chances of capturing prey, orb-weavers' webs are often located in high traffic areas. This makes damage to the web more likely, either when a scrumptious morsel gets tangled in it or when a bumbling human gets hung up for a few seconds!
Some orb-weavers remake their webs every day, whether it's damaged or not. Since spider's silk is made of protein, all this web-weaving requires considerable amounts of protein. What if a nice, protein-rich insect doesn't get trapped in the web every day? What's a hungry orb-weaver to do?
That's where the spider's genius for recycling comes in. When the orb-weaver takes apart an old web, it actually eats the silk. The protein from the old silk is never wasted, from the spider's digestive system, it goes to the silk glands to be made into a new web. Even if a spider misses a few meals, it can still go on spinning webs. This is thanks to the efficient recycling program that lets spiders conserve protein by eating old webs.