The article considers the co-vocalisation of Eagle Owl and other species of owls. The studies were carried out using digital voice recorders in the habitats of the eagle owl. The natural and climatic conditions of the area in which co-vocalisation was noted were analyzed. Rare cases of co-vocalisation of Eagle Owl and its prey, primarily the Ural Owl and the Longeared Owl, have been identified. Co-vocalisation was revealed only in winter and spring. This is due to the breeding season of birds. The presented study reflects the environmental sustainability of a particular area.
Co-vocalisation of Eagle Owl and other owls in the natural and climatic conditions of the Middle Volga region // IOP Conference Series: Earth and Environmental Science. 2023. 1229 (2023) 012007IOP

Both daily and seasonal year-round vocal activity of Ural owl were recorded in the Middle Volga River Region, Russia with the use of digital dictaphones. Two best-expressed peaks of longterm activity were revealed during the year: one starting in March and the other in September. In the spring, calls were recorded from 19:51 to 04:04. During this period, Ural owl’s total length of calls varied from 1 to 35 min per day, on average 12 min. The second annual peak was restricted to brood dispersal. In this period, the total duration of calls varied from 1 to 32 min per day, on average 9 min. In the spring, Ural owls always started calling from 24 min to 4 h after sunset. Vocalisation began at an average of 2 h 34 min after sunset. Completion of morning vocal activity always ended from 1 h 30 min to 2 h 40 min before sunrise.
Andreychev, A., Kuznetsov, V., & Lapshin, A. (2022). Vocal activity of Ural owl (Strix uralensis, Strigiformes, Strigidae) in the Middle Volga river region. Forestry Ideas, 28(1), P. 194-204.