Publication details
Nocování havrana polního (Corvus frugilegus) a kavky obecné (Coloeus monedula) na území města Brna v zimách 2011/12–2018/19
| Title in English | Night roosting of the Rook (Corvus frugilegus) and the Western Jackdaw (Coloeus monedula) in the city of Brno in winters 2011/12–2018/19 |
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| Authors | |
| Year of publication | 2023 |
| Type | Article in Periodical |
| Magazine / Source | Crex |
| MU Faculty or unit | |
| Citation | |
| Web | web vydavatele |
| Keywords | Rook; Western Jackdaw; winter night roosting; southern Moravia |
| Description | In the Brno region, the Rook (Corvus frugilegus) has been wintering with the Western Jackdaw (Coloeus monedula) for more than a century, and they usually used the Knížecí les Forest near Židlochovice as a night roost. In winter 2011/12, they however left the traditional roost and began to spend nights in the city of Brno (Pisárky district). From that time until the winter of 2018/19, roosts in Brno and Židlochovice interchanged several times. The aim of this paper was to describe the behaviour of wintering Rooks and Western Jackdaws at two night roosts in the city of Brno in past few years. They were located in close proximity to city buildings, in a mixed or deciduous forest on slopes above the Svratka River, 400 m apart. In the mornings, 36 min before sunset on average, birds usually flew out of the roosting place to a place about 300 or 800 m away and later they left it via the permanent corridors for food. Final pre-roosting gathering sites were 0.4–1.3 km away from the night roosting places. All the birds flew to the roosting place together as night fell. The total number of rooks and jackdaws gathering in Brno did not significantly change during the winters of the study period – it was around 15,000 individuals annually. The same night roosts were also used by crows (Corvus corone and C. cornix) in numbers of up to 100–150 individuals. |