Chimpanzees become stressed because of visitors at Delhi Zoo

From the archive record

A couple of Chimpanzees in Delhi zoo become mentally disturbed because of visitors. Their behavior has completely changed. These rare species Chimpanzee were taken here from Japan. "They become aggressive in the Zoo which they express with their mates. Their behaviors become very abnormal and the reason for this is the visitors. They have become aggressive for their mates which is not exactly and directly for their mates"