Fleas have very long rear legs with huge thigh muscles and multiple joints. When they get ready
to jump, they fold their long legs up and crouch like a runner on a starting block. Several of their joints
contain a protein called resilin, which helps catapult fleas into the air as they jump, similar to the way a
rubber band provides momentum to a slingshot. Outward facing claws on the bottom of their legs grip
anything they touch when they land.
The adult female flea mates after her first blood meal and begins producing eggs in just 1 to 2
days. One flea can lay up to 50 eggs in one day and over 2,000 in her lifetime. Flea eggs can be seen
with the naked eye, but they are about the size of a grain of salt. Shortly after being laid, the eggs begin
to transform into cocoons. In the cocoon state, fleas are fully developed adults, and will hatch immediately
if conditions are favorable. Fleas can detect warmth, movement, and carbon dioxide in exhaled breath,
and these three factors stimulate them to emerge as new adults. If the flea does not detect appropriate
conditions, it can remain dormant in the cocoon state for extended periods. Under ideal conditions, the
entire life cycle may only take 3 weeks, so in no time at all, pets and homes can become infested.
Because of these characteristics, fleas are intimidating opponents. The best way to control fleas,
therefore, is to take steps to prevent an infestation from ever occurring