Sergei A. Toropov The birds of Pamirs, Hissar, Alai and Tien Shan. Vol. 1. Non-passerines. Part 1. The second edition, corrected and revised – Bishkek, 2023. – 588 p., ill.
The next issue of Baikal Zoological journal, volume 1(33) for February 2023, has been published. The issue opens with the heading “Bird of the Year”. - it contains seven articles about the bird of the previous year 2022, the House Sparrow.
A large bird of prey (vulture, eagle) that is disturbed on the nest during incubation always soars to a high altitude and circles the sky for a long time before returning to the nest. This enforced absence may take 20-40 minutes or even more. At minus (say 10 degrees) temperatures, the embryo in the egg can die without heating in about 15 minutes.