The book "Subspecies of Mountain Tit" by author Joseph Grinnell is an authoritative study on the amazing world of birds. The author examines the mountain tit in detail, objectively describing its life, habits and habitat. The book provides information about the biological features of this species of birds, their role in the ecosystem of mountain massifs and interaction with other living creatures. Thanks to the work of Joseph Grinnell, readers get the opportunity to better understand the nature and diversity of life on our planet.