The zoo has developed rapidly and by 1987 it covered an area of over 40,000 square meters. Bears, elephants, pandas, lions, tigers, songbirds, hippopotamuses, rhinoceroses, antelopes and giraffes were brought in the late 1950s, and a gorilla cage, leaf-monkey cage and aquarium house, was opened, containing specimens of over 100 species of reptiles from all over the world, including crocodiles and pythons.