A flock of crows passes by the statue of Friedrich Wilhelm IV of Prussia (by artist Alexander Calandrelli) at the Alte Nationalgalerie on their way to the night roost in Berlin, Germany, January 14, 2019.
A “murder” (flock of crows) of Hooded Crows and Rooks fly together in an aerial river' to their night roost, located between the Berliner Dom and the Alte Gallery in the German capital's Museum Island. The phenomenon is unique to the early winter, the gathering provides the crows protection and warmth along side like information about food sources and more.