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The common kingfisher (Alcedo atthis), also known as the Eurasian kingfisher or the river kingfisher, is a small species of kingfisher with seven subspecies recognized within its wide distribution across Eurasia and northern Africa. It is resident in much of its range, but migrates from areas where rivers freeze in winter. Like all kingfishers, the common kingfisher is highly territorial; since it must eat around 60 per cent of its body weight each day, it is essential to have control of a suitable stretch of river. It is solitary for most of the year, roosting alone in heavy cover. If another kingfisher enters its territory, both birds display from perches, and fights may occur, in which a bird will grab the other's beak and try to hold it underwater. Pairs form in the autumn but each bird retains a separate territory, generally at least 1 km (0.6 mi) long but up to 3.5 km (2.2 mi), and territories are not merged until the spring. This female common kingfisher, of the subspecies A. a. ispida, was photographed near Kecskemét in Hungary.Photograph credit: Charles J. Sharp