The fauna is particularly diverse and varied because of the great diversity of biotopes. The tropical forest is the territory of the monkeys, whose concentration is one of the highest in the world. Baboons are ubiquitous, sometimes evolving into colonies of several hundred animals.  The sparse forest areas and grasslands are home to the traditional East African fauna: herds of buffaloes, giraffes and elephants among others. Among predators, lions have adapted to a very wooded environment and spend most of their time in the trees. The lake is a major sanctuary for birds. The park is home to more than 400 different bird species, including impressive colonies of flamingos and storks.