In this way, Lord Krsna and Balarama began to enjoy the residents of Vrndavana to Their full satisfaction as They herded the calves and cows on the bank of the Yamuna. In some places Krsna and Balarama were accompanied by Their friends. The boys were singing, imitating the humming sound of the drones and accompanying Krsna and Balarama, who were garlanded with forest flowers. While walking, the boys sometimes imitated the quacking sound of the swans in the lakes, or when they saw the peacocks dancing, they imitated them before Krsna. Krsna also moved His neck, imitating the dancing and making His friends laugh.
From Srila Prabhupada’s Krsna Book, ch. 15