Yes, some species are very hard to tell apart by eye. If you learn their songs it can become easier. Other hard-to-tell-apart species are Marsh tit and Willow t

Yes, some species are very hard to tell apart by eye. If you learn their songs it can become easier. Other hard-to-tell-apart species are Marsh tit and Willow tit. I am not confident after close to 10 years with birding interest.