Crows rest on a sculpture on the rooftop of the Neues Museum in Berlin, Germany, January 16, 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.