There are four stages in a flea’s lifecycle: egg, larva, pupa, and adult. They lay, tiny, almost microscopic, white eggs, 4-8 at a time, on the host. However, the eggs are not attached, so they fall off and hatch on bedding, carpeting, the ground, and other areas. Eggs usually hatch within 12 days and the larvae begin to feed on organic materials, including the feces of adult fleas that contain undigested blood. The larvae are blind, so they avoid light and hide in areas such as pet bedding, by baseboards, and other cracks and crevices. Adequately fed larvae in favorable conditions weave a cocoon and develop into adults within 4 weeks. In unfavorable conditions, they can stay in the cocoon for up to 20 weeks. These new adults emerge with the two goals of feeding and reproduction. They tend to spend all of their time on their host feeding, mating, and laying eggs. An adult female can lay up to 500 eggs in her life span.