My thought that they would fly back into their cage overnight was a bust. I have spent several hours catching them and putting them back in their home.
It reminded me when I was a child and we had gerbils. They were always chewing them selves out to freedom. We could usually find them near a heat source, like under a radiator. Our whole family would band together and go gerbil hunting. we could never find them all and for years we could hear them in the walls. probably multiplying like crazy.
Fun Fact: The average gerbil’s litter is 7+ babies, and they can have a litter every 2 months. That’s a hell of a lot of Gerbils. If you buy one as a pet stick to ONE. We all have to work together to keep Canada’s gerbil population in check.