Great Titis sometimes listed as one and the
same bird as the
which in turn belongs to a
group of tits that consists of several
populations that were earlier treated as subspecies of the Great Tit (fig.).
It is ashy grey, with white undersides.
However, the Great Tit is sometimes described as greenish-backed with a
yellowish underside, a description
also used for the Green-backed Tit.