They seem to have taken over trees once again across the north east.
Tent caterpillars are slithering all over local trees and on people's homes and decks.
It's not going to be a pleasant few weeks, as a local expert says they aren't going anywhere soon.
Most of them need to go through a couple more stages before they turn into moths.
For most people, these caterpillars are a total nuisance, so how can you get rid of them?
Dan Chaput is a staff scientist at Science North in Sudbury.
"There's a product called BTK, that's a bacteria that can be sprayed on the leaves and if they eat it, they get infected. And it only affects caterpillars, so it's a pretty benign product that you can use. Forty parts water and one part dish soap sprayed on the caterpillars blocks their breathing holes so that can also kill them too, but I mean, if there's this many of them around there's not a heck of a lot we can do." said Chaput.
Scientists say the caterpillars are on a ten-year cycle and they are prominent for 2 to 3 years, but then we won't see them again for a decade.
