Founded in 1936, it is one of the oldest animal collections in Europe. It was bombed twice during World War II, first in 1941 by the Nazis, then by the allies in 1944. Nearly all the animals were killed during the bombings, while some escaped their cages and roamed free around town. The contemporary zoo spans a surface area of 6 hectares, with over 2,000 animals from 200 species. On the occasion of its 60th birthday it was presented with a monument to its once most interesting and beloved of residents and the first chimp to arrive at the zoo, the ape Sammy. The Belgrade Zoo is open 365 days per year. The cashiers are open between 8 and 16:30 h in winter, and 8 to 20 h in the summer.