sentence: Most species associate in flocks of varying sizes throughout the year.
sentences_before: North-East European starlings migrate, but in southern and western Europe the birds are resident. Starlings are generally a highly social family.
sentences_after: These flocks may include other species of starlings and sometimes species from other families. This sociality is obvious in their roosting behaviour. In the non-breeding season some roosts can number thousands of birds. Flocks in Britain used to number millions of birds, though numbers are now fewer than they used to be.
concept_name: specie
headings: Starling Flocks
categories: Passeri