Spiders

Description

Spider eggs are laid within a protective silk egg sac; the number of eggs per sac varies widely by species.
Eggs hatch in about two weeks and the first instar spiderlings remain within the sac until undergoing their first molt.
Approximately one month after the eggs are laid, the second instar spiderlings emerge, many by chewing through the sac wall.
Spiderlings disperse through a variety of mechanisms, including clinging to their mother’s abdomen or “ballooning” to new destinations.
Most spiders go through several molts before reaching maturity, living one or two years, depending on the species.
Spiders can live from one to twenty years.