The Brown Recluse is regarded by some as more dangerous than the Black Widow spider because it is considered a house spider and isn’t as simple to identify.
The Brown Recluse spider will lunge and bite the prey in a vulnerable area and immediately back away while the venom acts to quickly paralyze them. The spider then moves in to feed. The same venom that acts to liquefy an insect’s innards for consumption also causes the “flesh rotting” appearances as shown.
During the day, Brown Recluse spiders spend their time in quiet, undisturbed places. If they are seen roaming during the day, pesticide applications, hunger, overcrowding or a desire to find a mate has probably brought them out. Sometimes they will be discovered trapped within a smooth surface such as a bathtub or sink. But because they are primarily nocturnal, they will typically begin to stray from their hiding place about an hour or two after dark. This is when they spend their time hunting for food. This explains why many bites occur while victims are sleeping. While they are hunting for food, they may crawl up onto a bed and bite when the victim inadvertently rolls onto the spider during normal sleep movements.
Brown Recluse spiders are remarkably resilient and can survive 6 to 12 months with no food or water and have an average life span of 2 to 4 years. In laboratory conditions, they have lived as long as 7 years.