Momma Bear appears in "Storytelling." She is overprotective of Teenage Bear. When Finn won the battle between him and Teenage Bear, Momma Bear begins to cry, thinking that he was dead. She continued to hold herself protectively over Teenage Bear and claim he was dead even after he was talking, apparently without serious injury. Finn tells her she needs to stop spanking her son's face so much at the Rite of Forest Justice. She agrees with him, saying "It's time to let you grow up."
Momma Bear just looks like a big black bear. Her lips are outlined unlike Teenage Bear's. She has spiked fur on her back unlike Teenage Bear.
You killed him! You killed him and now he's dead!
He's right. It's time to let you grow up.