When they detect the ripples from prey, they run across the surface to subdue it using their foremost legs, which are tipped with small claws; like other spiders they then inject venom with their hollow jaws to kill and digest the prey.
They mainly eat insects, but some larger species are able to catch small fish.
Why do spiders stay in one spot for days?
If the spider needs to spend long periods moving or exerting itself, it will deprive its other organs of this blood, and cause it to tire out. This is why most spiders tend to “creep” rather than run when they are not being disturbed. Spider Metabolism. This is the other big reason you don’t see spiders move very much.
Why do spiders have 8 legs?
Spider legs are modified appendages from an ancestor that had many more pairs of legs, but most of the legs of spiders got modified into other things. There probably isn’t any particular reason why spiders evolved to have eight, insects six, horseshoe crabs ten, or any other number for the jointed-legged animals.
How do spiders lose their legs?
A spiders body is covered in a hard outer skin known as an exoskeleton. If a spider is unfortunate enough to lose a leg, then provided it still has at least one more moult left in its life cycle it’s able to grow a new leg. In most species the new leg is thinner and shorter than the original leg.
Do spiders breathe through their legs?
Some spiders have book lungs. A book lung has a stack of soft plates called lamellae. Oxygen in the air passing between the lamellae diffuses through the tissue into the blood. Other spiders have tracheae which are breathing tubes held open by rings of chitin.