Question

how does toto come to grandfather's private zoo' ?​

Answer 1

grandfather get it from a rikshaw driver and toto was not comfortable with other animals in the private zoo

Answer 2

Full,exact and right answer here mate..

Toto was in the captivity of a tonga owner. The grandfather gets sympathetic with the monkey and thinks that his private zoo would be a better place for Toto. So he purchased Toto from the tongawallah for five rupees.