Chuggington (2008)

Season 3: Episode 10

While delivering some special equipment to the safari park, Mtambo asks Koko if she can keep a secret. Tonight, they are hoping to catch a very rare site on camera, a luna dance performed by the bats to a special bird song. Dr Gosling wants Koko to record the sound but she's can't tell anyone about it, they need the safari park to be completely silent or they might scare the bird.