"Once, while Krsna was in the pasturing ground with His cowherd boys, His friends requested Him to go to the Talavana forest, where Gardabhasura, a disturbing demon in the shape of an ass, resided. The friends of Krsna wanted to eat the fruit from the forest trees, but they could not go because of fear of the demon. Thus they requested Krsna to go there and kill Gardabhasura. After Krsna did this, they all returned home, and their report of the day's activity perturbed mother Yasoda because Krsna had been sent alone into such danger in the Talavana forest. Thus she looked upon the boys with anger."
Nectar of Devotion, Chapter 47
"The cowherd boys all depend on Krsna. Once they wanted to take fruit from a forest of palm trees, but there was a demon named Gardabhasura who would not allow anyone to enter that forest. Therefore Krsna's cowherd boyfriends said to Krsna, "Krsna, we want to taste that fruit, if You can arrange for it." Krsna immediately said yes, and He and Balarama went to the forest where that demon was living with other demons, who had all taken the shape of asses. When the ass demons came to kick Krsna and Balarama with their hind legs, Balarama caught one of them and threw him into the top of a tree, and the demon died. Then Krsna and Balarama killed the other demons the same way. Thus Their cowherd friends were very much obliged to Them."
Teachings of Queen Kunti, Chapter 14
Bhaktivedanta Book Trust. Excerpted from text and purport of HDG A.C. Bhaktivedanta Swami Srila Prabhupada.