The Second Jungle Book by Rudyard Kipling Chapter 15 Page 13

The Four did not follow him on these wild ringings of the Jungle, but went off to sing songs with other wolves. The Jungle People are very busy in the spring, and Mowgli could hear them grunting and screaming and whistling according to their kind. Their voices then are different from their voices at other times of the year, and that is one of the reasons why spring in the Jungle is called the Time of New Talk.

But that spring, as he told Bagheera, his stomach was changed in him. Ever since the bamboo shoots turned spotty-brown he had been looking forward to the morning when the smells should change. But when the morning came, and Mor the Peacock, blazing in bronze and blue and gold, cried it aloud all along the misty woods, and Mowgli opened his mouth to send on the cry, the words choked between his teeth, and a feeling