All spiders produce silk
Something common to all 40,000 species of spiders is that they all spin silk. And as spiders have evolved, so has their ability to work with silk. One spider can produce up to seven different types, each used for a different purpose such as spinning webs or capturing prey.
One Species is mothly vegetarian
It was thought that all spiders were carnivorous, capturing and eating other insects, but one species in Central America has been found to be mostly herbivorous! Bagheera kiplingi inhabit trees that produce protein-rich buds on their leaves. These buds are part of a symbiotic relationship between the trees and ants, but B. kiplingi also benefit from consuming the buds. However, during dry seasons these spiders are known to be carnivorous. They may cannibalize each other or steal ant larvae when food is scarce.
Spiders are nearsighted
Most spiders have eight eyes, but some, like the brown recluse spider, only have six. Spiders typically have a main set that can create images while the secondary sets can only detect light and shadow. But even with all of those eyes, spiders cannot see far into the distance.
Females can lay up to 3,000 eggs at one time
These eggs are housed in one or more silk sacs. The level of care a female spider provides for her young varies by species. Some females will die shortly after laying eggs while others will carry spiderlings on their backs or share prey with them.
Jumping spiders can jump up to 50x their own length
When hunting or trying to escape a predator, jumping spiders are able to make very agile movements and jump multiple times their body length. This is possible due to an internal hydraulic system. Jumping spiders can alter the pressure of fluids in their legs resulting in a springing motion that propels the spiders forward.
The 'daddy long-legs' you see might not actually be a spider
The nickname 'daddy long-legs' has been given to several different pests, only one of which is an actual spider. Crane flies, harvestmen and cellar spiders are all colloquially identified as 'daddy long-legs.' Only cellar spiders are spiders. Harvestmen are in the arachnid family, but they lack venom and silk glands. Crane flies are agricultural pests with very long legs and the ability to fly.
Spiders are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms.