Spring is here, and with it, the start of flea season. V the warming weather, people and also their pets space spending an ext time external — which rises the chances of bringing house a hungry “itch hiker.”

While pet owners curse the tiny insects and look because that a means to rid castle from their homes, it turns out fleas actually perform some remarkable athletic feats, choose jumping 50 time their height — the identical of a human being jumping 300 feet — or leaping so rapid that castle take turn off 100 times much faster than the blink of one eye.

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No bigger than a sesame seed and also flattened side to side, fleas deserve to slip through fur with ease. But what makes them really elusive is their jump. It’s so rapid they seem to just vanish and reappear somewhere else.

“It"s there and also then it"s gone,” said Gregory Sutton, a professor of biomechanics at the college of Lincoln in the united Kingdom.

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An adult cat flea needs to gain onto its host in order come feed and also find a mate. (Josh Cassidy/keolistravelservices.com)

Sutton provides high-speed cameras and magnifying lenses to research how fleas are able to perform their age-old disappearing tricks.


In one current study, Sutton discovered that the method different pets jump is supposedly not one size fits all.

Fleas room ridiculously quick jumpers. Sutton discovered that a flea could complete its takeoff in as tiny as one millisecond.

Adult fleas use that fast jump to acquire away native danger, but additionally to leap onto your furry or feathered hosts. As soon as they’re aboard, fleas use their spicy tube-shaped proboscis, dubbed a stylet, to pierce the skin and suck the host’s blood.

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Fleas filter out and also excrete water indigenous the blood as they room feeding come make more space in your digestive tract for an ext blood. (Josh Cassidy/keolistravelservices.com)

Once both males and also female fleas feed, they mate and also the females place eggs. Unlike with other pests favor lice, flea eggs don’t stick to fur. Instead, they fall from the host’s fur, generally into that is bedding.

But eggs aren’t the only things adult fleas create. They’re likewise prodigious poopers.

The eggs and flea poop combination are uncovered deep in the pet’s fur, or ~ above its bedding. It’s simple to discover with a flea comb.

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Cat fleas favor this one recorded in a flea comb, space the most common kind of flea to uncover on pets in the U.S. (Josh Cassidy/keolistravelservices.com)

“People contact it salt and also pepper,” said William Donahue, an entomologist, and owner that Sierra study Laboratories in Modesto, whereby he evaluate treatments versus fleas and also other pests. “It will certainly be the dark black color fecal spots, to add the white pearlescent eggs.”

The eggs and also poop autumn out the the host’s hair when the moves. It’s especially common to discover them in the pet’s bedding.

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Larval fleas might wait to hatch till they sense the come of a potential host animal. (Bayer animal Health; SungShik Shin, Chonnam national University)

“They"re not on the surface of hardwood floors or tiles or anything prefer that,” Sutton said. “They autumn into the pet"s bedding, and also there"s normally a microclimate in there with greater humidity, i beg your pardon is conducive to them surviving.”

After a couple of days, the egg hatch and the virtually microscopic larvae wiggle out. Castle look favor hairy white worms the size of a item of dust. The larvae invest weeks crawling about the bedding, or nest in the situation of countless birds.

The larvae feeding on whatever organic issue they can find. However their favorite food comes from their parents. Adult flea poop is just semi-digested blood and it has tendency to autumn in the same places as the eggs.

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A flea larva feeds top top the dark-colored feces of an adult flea. (Josh Cassidy/keolistravelservices.com)

After a most gorging and also growing, the wiggling larva encases chin in a cocoon. A couple of job later, the adult flea emerges.

The an initial thing it needs to do is uncover a hold to hitch a journey on. That’s where the flea’s spectacular jump comes in.

Fleas deserve to jump end fifty time their own height. They have to accelerate an extremely quickly come launch themselves.

“But they’ve obtained short little legs,” Sutton said. “So the fleas don’t have actually a many time come accelerate prior to they leave the ground.”

You can think fleas have special muscles in their legs that allow them to jump extra fast. Not so.

“When friend look at the muscles in these guys,” Sutton said, “it just looks like normal muscles, and muscles can only move so quickly. So they require something come amplify the power output.”

What they have actually is a spring. But it’s not like the coiled steel spring the might very first come to mind.

“When ns say spring, I median something that is storing and releasing mechanical power in a recoil,” Sutton said.

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Sutton decided to work-related with hedgehog fleas due to the fact that they don’t bite people. (Gregory Sutton, university of Lincoln, UK)

Adult fleas usage their muscles to store power by bending a part of their exoskeleton called the pleural arch.

“Basically, it"s their metaphorical rib cage,” Sutton said. “It’s the component of the flea’s human body that would certainly be closest come the person rib cage.”

When the flea releases the bending, its exoskeleton snaps back into its original shape exceptionally quickly. The energy from that recoil gets transmitted v the flea’s tiny body into its oversized behind legs which press off the ground, sending out the flea soaring into the air. Larger animals like dogs and also cats have actually longer legs, and also they power their jumps through muscles alone.

Sutton likened the flea’s run to firing a bow. An archer provides the muscles in his or her eight to load power into a bow, which is released very suddenly, and transferred into the lightweight arrow really quickly.

But because that something heavier prefer a spear, humans wouldn’t use a bow, and also instead would use muscles in their arm and also shoulder to heave the more heavier object directly.

The two different systems it seems to be ~ to accomplish in pets around the dimension of a frog, with some smaller, quicker-jumping frogs using the spring device like the flea, and larger frogs, choose bullfrogs, utilizing muscles like a cat or dog.

Sutton studies pet jumps in the hope that his findings will aid the development of jumping robots.

“One that the things that the insects do far better now 보다 robots is generating jumps,” the said. “The jumps of little insects room much quicker and much more controlled 보다 the jumps the equivalently sized robots. And also insects can jump in preparation for flight. That’s incredibly helpful as well, the we"re trying to number out just how to obtain robots to do that.”

But simply to store the document straight, while castle are amongst the fastest animal jumpers, fleas walk not optimal Sutton’s list. Froghoppers, also called spittlebugs, take it the peak spot.

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“Froghoppers room the faster of the insect jumpers, but they live on plants and they"re in reality spectacularly terrified of us so us don’t see them really often and don’t notice them,” said Sutton.