Corvidae is the biological family of birds that includes crows, ravens, rooks, jays, treepies, jackdaws, choughs, nutcrackers, and magpies. Corvids are strongly built, stout-billed birds 23 – 71cm (9 – 28in) long. Over 120 corvid species occur throughout the world; most are nonmigratory. They are found from tropical wet forests to deserts and from arctic zone to high mountains. Social organization is highly developed. They are considered the most intelligent of the birds.
– Corvus cornix L.