“Mother Yashoda was able to trace Krishna by following His butter-smeared footprints. She saw that Krishna was stealing butter, and thus she smiled. Meanwhile, the crows also entered the room and came out in fear. Thus mother Yashoda found Krishna stealing butter and very anxiously looking here and there.” (Shrila Prabhupada, Shrimad Bhagavatam, 10.9.8 Purport)