From Muppet Wiki

Bubo is one of the Muppets from Barrio Sésamo, the Spanish co-production of Sesame Street, having appeared from 1996 to 2000.

Bubo was a brown owl who spoke with an adult-like, slow voice. He was an intellectual adult offering a view of extreme learning. He was one of the adults interacting with childlike Bluki to offer him an interesting approach to learning.

The name "Bubo" is a variation "búho", the Spanish word for "owl".