Thousands of starlings fly in a ‘murmuration’ as they return to roost at dusk near Charlton-on-Otmoor

Thousands of starlings fly in a 'murmuration' as they return to roost at dusk near Charlton-on-Otmoor, southern England, February 11, 2016. REUTERS/Eddie Keogh

Thousands of starlings fly in a ‘murmuration’ as they return to roost at dusk near Charlton-on-Otmoor, southern England, February 11, 2016. REUTERS/Eddie Keogh