Jumping spiders are the largest family of spiders. They do not build a web to trap insects, but jump on their prey and grab it with the jaws. They still produce silk for safety lines while jumping and also to build a tent as shelter from bad weather and to sleep at night. As most spiders they have four pairs of eyes, which give them a 360-degree view of the world. Their large frontal eyes are build like telescopes and provide them with very sharp vision. A mobile retina allows them to scan the object they are looking at.
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