Almost all spiders are predators, and eat insects and other arthropods (including other spiders).
Most use venom from their fangs to kill their prey.
It is rare for spiders to capture prey that are much larger than they are.
It is also difficult for most spiders to capture prey that are very much smaller than they are.
Most species of spiders cannot live close together because they treat each other as their next meal, but there are some spiders that form colonies.
Spiders eat not only spiders of other species, but spiders of their own species.

The black widow spider got its name because the females sometimes eat the males that mate with them.
This may also happen in other species.
Each species of spider has its own way of communicating with other spiders they meet.
Because of the danger of being eaten, in some species the males have special hooks on their front legs with which they hold the female while they mate.
Others bring the female something to eat.
There are a few species in which the male spiders construct their own little webs that are connected to the webs of the females.
In these species, the male is so much smaller than the female that it would be difficult for her to actually capture the male.

Most spiders have such poor vision that they will not even notice a dead insect.
Jumping spiders are one exception to this rule.
They have such good vision that they can find recently dead flies or other insects to eat.
Almost all spiders are predators, and eat insects and other arthropods (including other spiders). Most use venom from their fangs to kill their prey. It is rare for spiders to capture prey that are much larger than they are. It is also difficult for most spiders to capture prey that are very much smaller than they are. Most species of spiders cannot live close together because they treat each other as their next meal, but there are some spiders that form colonies. Spiders eat not only spiders of other species, but spiders of their own species. 
The black widow spider got its name because the females sometimes eat the males that mate with them. This may also happen in other species. Each species of spider has its own way of communicating with other spiders they meet. Because of the danger of being eaten, in some species the males have special hooks on their front legs with which they hold the female while they mate. Others bring the female something to eat. There are a few species in which the male spiders construct their own little webs that are connected to the webs of the females. In these species, the male is so much smaller than the female that it would be difficult for her to actually capture the male.
Most spiders have such poor vision that they will not even notice a dead insect. Jumping spiders are one exception to this rule. They have such good vision that they can find recently dead flies or other insects to eat.
Spider