They are also commonly seen in sunlight areas while running over tree bark, under stones, on bushes, and along fences and decks. Adult male jumping spiders are found in April through July, and females are spotted from mid-May to late October, usually around windows and doors because there are more insects attracted to these areas. It’s thought that the older spiderlings overwinter in a retreat and become adults in spring. In the New England States, zebra, black and other colored jumping spiders mate in May, and eggs are laid in June and July. Outside, jumping spider retreats are found under loose bark and between leaves. Oftentimes, jumping spiders will build a new retreat for each activity – under furniture, in drapery folds, between books, in cracks of wood floors, around doors and window moldings, etc. The egg sacs are typically lens-shaped and suspended like a hammock from the retreat’s wall. These retreats are used for molting, hibernation, nighttime seclusion and laying eggs. Jumping spiders do not construct snare webs but do build web retreats, which are loosely woven, saclike and composed of several envelopes. However, their night vision is very poor. In general, jumping spiders have the best vision of any spider species, being able to detect and react to movement up to 18" (45 cm) in distance. They employ silk as a dragline when they jump, and the dragline acts as a safety line. When threatened, jumping spiders may jump 20 times their body length. Jumping spiders can rapidly move both sideways and backwards for short distances, and pounce on passing prey. They are excellent hunters, due to their jumping ability and swift reflexes. Unlike most spiders, jumping spiders are active during the daytime and prefer sunshine.
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