The Cunning Little Vixen
The Cunning Little Vixen (original title: Příhody lišky bystroušky, literally translates to The Adventures of Vixen Sharp-Ears) is an opera by the Czech composer Leoš Janáček.  Janáček loved animals, and in this opera some of the characters are humans but some are animals.  Some of the little animals, (like the grasshopper, frog and cricket) are usually sung by children.