Bed bugs have been around longer than humans. When researchers used bed bug DNA to get an idea of when they first evolved, they found that the ancestors of today's bed bugs were already tiny but successful predators over 115 million years ago, during the reign of the dinosaurs.
What they were preying on back then, we don't know, possibly ancient birds. What we do know is that when the first bats appeared, bed bugs were present. A few enterprising individuals crawled into the caves where bats slept to enjoy a hearty meal. From there, several species of bed bugs evolved to feed on their blood, according to the research of Prof Klaus Reinhardt, an evolutionary biologist at University of Tübingen, Germany.
As early humans took shelter in those same caves, bed bugs suddenly found they had a larger, juicier mammal to feed on. Somewhere between 900,000 and 100,000 years ago (Reinhardt reckons 245,000 years ago) bed bugs added humans to their roster of victims - a unique move for a parasite, which usually thrive by being highly specialised to one type of host.
The oldest recorded proof of bed bugs that mingled with humans are the 11,000-year-old bugs archaeologists found in caves in North America. There are also fossilised tracks left by bed bug ancestors in ancient Egyptian workers' living quarters from 3,550 years ago, as well as Greek comedy texts from 423 BCE with characters saying "What a torture the bugs will this day put me to." Today there are about 100 species of bed bugs, all part of the insect family, known as Cimicidae.
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