Biology
for Cat Flea
Cat fleas undergo complete metamorphosis — egg, larva, pupa, adult. A female lays eggs only after a blood meal: UF/IFAS describes up to one per hour, while UC IPM puts daily output near 20 to 50. Source: https://ask.ifas.ufl.edu/publication/IN137 Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7419.html
The smooth, dry eggs slide off the coat into carpet, bedding, and soil. Hatching larvae feed on debris, especially the dried blood and droppings ("flea dirt") that adults leave behind, then spin silk cocoons to pupate. The full cycle usually runs about one to two-and-a-half months depending on heat and humidity, and the pupa can wait a long time before the adult emerges. Source: https://ask.ifas.ufl.edu/publication/IN137 Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7419.html Source: https://texasinsects.tamu.edu/cat-flea/