Three and a half trillion.

That’s how many insects migrate over southern Britain in one year, according to a study published Friday in the journal Science. To put that number in perspective, that’s the equivalent of more than 54 bugs for every person in Britain.

The team of scientists from Britain, China, and Israel spent a decade tracking insect migration at altitudes between 492 and 3,937 feet using entomological radar and an aerial insect-catching net.