猿，超级猿 Bij de beesten af (1972)认领

　　In 1972, Haanstra released another feature length documentary, the outstanding Ape and Super Ape. The culmination of his interest in the behaviour of humans and animals, ultimately became Haanstra's personal favourite. Haanstra studied many different animals in their natural environment, recording their behaviour aggression, territorial instincts, hierarchies and mating habits ...