{"fact":"In a study performed in a Polish national park, hooded crow nests were protected from human disturbance, allowing the observation of natural behaviors not previously well-documented.","context":"The study area is largely undisturbed by humans because it is inaccessible by foot and water-logged throughout the year. This allowed us to study the behaviour of a primeval hooded crow population that is unmodified by human contact.","source":"Piotr Zduniak; Jakub Z Kosicki; Reuven Yosef, Sexual aggression by intruders in hooded crow Corvus cornix, 10.1007/s10211-015-0222-z","index":667}