{"fact":"Carrion crows and hooded crows are so closely related that scientists sometimes consider them a single species, making it difficult to study their habitats separately.","context":"In 2003, the Hooded Crow was recognized as a separate species from the Carrion Crow due to the positive assortative mating of the two taxa and the reduced fitness of their hybrids [61]. Thus, information regarding each species separately is still lacking and they are often described as both species merged as one [62–65].","source":"Farah Abou Zeid; Federico Morelli; Juan Diego Ib'añez-'Alamo; Mario D'iaz; Jiř'i Reif; Jukka Jokimäki; Jukka Suhonen; Marja-Liisa Kaisanlahti-Jokimäki; G'abor Mark'o; Raphaël Bussière; Marko Mägi; Piotr Tryjanowski; Theodoros Kominos; Antonia Galanaki; Nikos Bukas; Fabio Pruscini; Leszek Jerzak; Olaf Ciebiera; Yanina Benedetti, Spatial Overlap and Habitat Selection of Corvid Species in European Cities, 10.3390/ani13071192","index":612}