Nursery web spider

Like other members of the Pisauridae, Pisaurina mira carries its eggs along with it in a sac that is secured both by a thread of silk linking it to the spider's spinnerets and by being held by the spider's chelicerae. When the eggs are nearly ready to hatch the mother will build a nursery web within which the egg sac is then hung. After they hatch, and until they undergo their first molt, the infant spiders will inhabit the rather large volume enclosed by this nursery web. The mother spider will station herself nearby in order to defend the nursery. (information from Wikipedia)