Sometimes, zookeepers throw in magazines for them to tear up, hay with nuts and seeds, or they turn on the radio. Conny also mentioned a psychology experiment done on the response of primates to music. Primates are given switch buttons of different kinds of music and the most popular music was disco music. The monkeys dance and get excited when they hear the disco music. Also, monkeys like to interact with the public, because the smell of perfume and little kids running around are new things to them.
Monkeys are curious animals and they love exploration.
Conny also mentioned the sensitivity of those animals to human emotion. When the keepers are calm then the animal will calm down automatically. Both of the keepers, Conny Carson and Kim Lemier are very bright people because they understand if they are in a bad mood the monkeys will not be happy, either. Therefore, if the keepers feel down they avoid coming to work. You may think zookeepers only have to deal with animals, but it is not true according to Kim.