With a body roughly the size of a dime, mature female Black Widow Spiders are shiny, jet black and usually have a red to orange hourglass-shape mark on the underside of the abdomen. They are most likely to attack when provoked or accidentally touched. Males are smaller and less likely to bite.
Brown Recluse Spiders
Brown Recluse Spiders are light-to-dark brown, about 1/3 to 1/2 inch in length, with a violin-shaped white marking on their backs. This marking gives them the nickname "Fiddle Spider." As their name suggests, they are often found in secluded spaces, like under rocks in the outdoors, under sinks, in crawlspaces and in boxes indoors.
Caterpillars are the larvae of moths and butterflies. Caterpillars can be smooth, hairy or spiky.