No shortage of species
Scientists estimate there are more than 2,500 species of fleas on the planet. Within the lower 48 U.S. states, flea species number 325.
They lay a lot of eggs
Fleas lay eggs on other animals, and a single adult flea can lay 50 eggs per day and 2,000 throughout its very short lifespan.
A troubled past
During the Middle Ages, tens of millions of people died of the plague, or Black Death, as it spread across Asia and Europe. Fleas carried the plague bacteria and transmitted it to humans.
Fleas don’t thrive in low humidity, which is why they aren’t as much of a pest problem in arid areas such as the Southwest.
A love for leaping
Cat fleas, the most common flea pest, can propel themselves a full 12 inches forward or upward. That’s a jumping distance equal to about 150 times its own height.