Chil is a kite bird that helped Mowgli escape from the Bandar-Log. Mowgli used the Master language to talk to Chil and relay the message of where he was to Baloo and Bagheera. He also helped out and wasn't just in Mowgli's story.
Voices of Chil
Don Brown - Adventures of Mowgli
Terrence Scammell - Jungle Book Shonen Mowgli
Vincent Price - The Jungle Book (1990)