Here's why:
* Mr. Pignati was deeply in love with Bobo. He saw him as a companion and friend, and he cherished their time together. He never wanted to risk Bobo being taken away from him, so he kept him a secret.
* He was afraid of judgment. Mr. Pignati was aware that people might think he was crazy for having a monkey as a pet, especially after his wife passed away. He didn't want to face that kind of scrutiny.
* He wanted to protect Bobo. Mr. Pignati was afraid that if he told people about Bobo, they might try to take him away or exploit him.
So, while Mr. Pignati never explicitly described Bobo, his actions revealed his love and care for the monkey:
* He gave Bobo special treats and let him play with his belongings.
* He created a comfortable environment for Bobo with a swing and plenty of toys.
* He took Bobo with him on outings and kept him hidden in his car.
John and Lorraine only discovered Bobo through their own curiosity and investigations.