The Caspian tit (Poecile hyrcanus, formerly Parus hyrcanus) is a passerine bird in the tit family. It is often lumped with sombre tit Poecile lugubris (del Hoyo et al. 2007), but some research suggests that it is a separate species, more closely related to willow and Songar tits (Harrap & Quinn 1996). It breeds in the deciduous mountain forests of northern Iran, just extending into Azerbaijan. The most common call of this generally quiet bird is a thin zsit, but a nasal double note, chev chev, is also given. It feeds on caterpillars, insects and seeds, much like other tits.