There are more than 2,500 species of flea, and some of them prefer to dine on human blood.
Fleas have a number of impressive adaptations that make them difficult to control, beyond the ability to jump up to 100 times farther than the length of their bodies.
Fleas can sense the breathe, warmth, and vibrations of animals, which helps them find their next meal. Once they land, fleas insert a straw-like structure to suck blood and release proteins that keep the blood flowing. Female fleas also lay up to 40 eggs each day.
Fleas are implicated in the spread of plague in the Middle Ages. While plague is rare today, fleas still transmit the dangerous disease on occasion.
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Following is a transcript of the video.

Narartor: The Black Death was one of the most devastating pandemics in human history. Between 1347 and 1351, it wiped out 30% to 50% of the entire population of Europe. And if there’s one animal to blame, it’s likely infected fleas, making them one of the deadliest insects in history. Now, of course, fleas no longer kill millions of people. But as it turns out, they still transmit plague, they’re still a nuisance, and they’re still incredibly difficult to kill. Fleas are one of the oldest pests on the planet. In fact, primitive fleas were dining on dinosaur blood about 165 million years ago. And they’re also one of the most abundant. Today, there are more than 2,500 species of fleas across the world, like the cat flea. Those are the ones you’re most likely to find feasting on your dog or your cat. And then there are species like the human flea, which actually seek out human hosts specifically. And seeking is a flea’s specialty. They can sense your …read more

Source:: Business Insider


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