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<p>Hooded Crows (<i>Corvus cornix</i>) are widespread and omnipresent throughout the urban areas of Zagreb, Croatia. This study aimed to identify the factors contributing to the colonisation of Hooded Crows in Zagreb. From 2022 to 2024, 729 active nests were recorded. The average nest density in the entire research area of 84.6&#xa0;km² was 8.62 pairs/km², but with significant variation between the different parts of the city (0.8–28.3 pairs/km²). The highest nest densities were recorded south of the Sava River, near the city landfill, in areas where built-up, grassland, and tree cover habitats were abundant and interspersed rather than homogeneous. Birds built nests on 43 tree species and three subspecies. Our analyses showed that Hooded Crows have a preference for the London planetree <i>Platanus acerifolia</i>, Poplar (<i>Populus sp.)</i> and Pine (<i>Pinus sp.)</i> species of trees, and the height of trees within the range of 11 and 20&#xa0;m. These findings contribute to understanding how urbanisation influences avian nesting behaviours, providing insights into nesting site preferences that could inform future urban planning and management efforts.</p>

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Nesting ecology of urban hooded crows (Corvus cornix): tree and nesting site preferences

  • 期刊论文

  • 发表日期：

    2026年7月15日

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  • Louie Taylor,
  • Sanjin Hadžalić,
  • Katarina Horvat,
  • Iva Šoštarić,
  • Biljana Ječmenica

摘要

Hooded Crows (Corvus cornix) are widespread and omnipresent throughout the urban areas of Zagreb, Croatia. This study aimed to identify the factors contributing to the colonisation of Hooded Crows in Zagreb. From 2022 to 2024, 729 active nests were recorded. The average nest density in the entire research area of 84.6 km² was 8.62 pairs/km², but with significant variation between the different parts of the city (0.8–28.3 pairs/km²). The highest nest densities were recorded south of the Sava River, near the city landfill, in areas where built-up, grassland, and tree cover habitats were abundant and interspersed rather than homogeneous. Birds built nests on 43 tree species and three subspecies. Our analyses showed that Hooded Crows have a preference for the London planetree Platanus acerifolia, Poplar (Populus sp.) and Pine (Pinus sp.) species of trees, and the height of trees within the range of 11 and 20 m. These findings contribute to understanding how urbanisation influences avian nesting behaviours, providing insights into nesting site preferences that could inform future urban planning and management efforts.