It's possibly the chilly weather - they may still be in there in the warmer centre! No idea about the ants, unless they've made a nest in there, which is a nuisance for you when you want to use the compost.

Ants in the compost heap or bin means that it's too dry & needs water to be added. I've had no worms in mine either - like Spritzhenry I blame the cold weather. I found ONE worm when turning the compost yesterday, so I guess they're making their way back in.

thanks - glad I'm not alone!