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All fleas are obligate parasites of vertebrates and can be found not only on humans but also on other mammals and even birds. They are exceptionally adapted to life in fur or feathers, with laterally compressed bodies and strong claws that enable them to cling tightly to their hosts, even when the host attempts to dislodge them by scratching. Fleas are wingless and cannot survive long without a host, meaning they are typically transmitted through direct or close contact. For humans, fleas are more than just an occasional nuisance; they also serve as vectors for serious diseases, such as the plague, which they can transmit from other animals. The physical abilities of fleas are astonishing when compared to humans. If a flea were scaled to the size of a human, it could jump over 100 meters high, and it would have the strength to push a wagon loaded with 12,000 tons!
