can different types of tits crossbreed? have seen on feeder in garden what i first thought was a baby great tit. but, there is a family of great tits and this little chap has not grown. not a blue tit either. always looks scruffy.
Yes, they can hybridise, but seldom do so. It is more likely to be one of the common young ones not coloured up or a bedraggled one ready to molt into a new plumage.