My Little Pony...song in a rainforest?

I'm searching for this one episode of My Little Pony that was always a favorite when I was very young, but my memories of it are vague. All I remember was the ponies in a rainforest and one of them (I think she was teal with red hair) was singing a song as they went through it. Does anyone know the name of this song/episode? It would be fantastic.