From Muppet Wiki

Da Niao is a character on Zhima Jie, the Chinese co-production of Sesame Street. Da Niao is Big Bird's identical cousin.

Sesame Workshop description

Big Bird (Da Niao) is the American Big Bird’s cousin -- a tall, six-year-old, yellow bird who represents every child. He is enthusiastic, friendly, cheerful, and a bit slow at times. Children understand and identify with Big Bird’s excitement about new things and his disappointment when things don’t work out. They also see his willingness to try again, to correct his mistakes, and find solutions to problems through persistence. Da Niao lives in a nest in the park on Zhima Jie, and loves to eat birdseed cookies. His best friends are Little Plum and Hu Hu Zhu.