Fleas usually live for about 100 days and reproduce rapidly, with females producing 400-500 offspring. They are highly dependent on rodents and other mammals as their hosts and usually remain on them at all times. Fleas can jump as high as 8 inches vertically, which is 150 times their own height. They can infest household pets, as well as wild animals like opossums, raccoons, and skunks. Fleas can also hitch a ride on shoes, pant legs, or blankets, allowing them to spread to new environments.