© Copyright: Images: Jari Peltomäki, Jouko Lehmuskallio, M. & W. von Wright: Svenska fåglar (Kansalliskirjasto, The National Library of Finland). Recording: Jan-Erik Bruun. All rights reserved.
- Name also: Eurasian Jackdaw, European Jackdaw, Western Jackdaw
- Family: Crows – Corvidae
- Appearance: A medium-sized crow. Mainly blackish with paler greyish colouring on back and side of head and neck. Eyes greyish white. Beak clearly smaller than beak of Hooded Crow.
- Size: Length 30–35 cm, wingspan 64–73 cm, weight 180–270 g.
- Nest: In a cavity on a building, in natural holes or in nest boxes. Made of sticks and straw, lined with hair, feathers, bits of paper, wool etc.
- Breeding: 4–7 eggs laid in April–May, incubated by female for 17–23 days. Fledglings remain in nest for about 30 days, and learn to fly within about 35 days.
- Distribution: Breeds near human settlements in southern and central regions of Finland as far north as Oulu. Numbers have increased steeply. Finnish breeding population estimated at 80,000–130,000 pairs.
- Migration: By day. Some birds do not migrate but stay in Finland for the winter. Others leave September–November and return in March–April after wintering in Denmark, Sweden or around the North Sea.
- Diet: Omnivorous.
- Calls: A shrill “kyaa” often repeated several times.
Jackdaws are pigeon-sized members of the crow family, mainly dull black in colouring. They have paler grey colouring on their heads and necks below and behind their eyes, but the extent of this paler colouring varies between individuals, and some birds have a pale wreath-like ring around their necks. They have shortish black beaks and black legs. Their irises are greyish white (adults) or grey-blue (juveniles).
Jackdaws are very sociable, and their flocks have well-defined hierarchies. Pairs tend to stay close together within larger flocks.