Max Bird, the shorter and fatter of the Bird Brothers, was an antique collector. Max Bird is portrayed as wearing a brown coat, black tie and yellow shirt and bears a sinister-look countenance.
He and his brother, Gustav, had obtained one of the three ship models of the Unicorn. The pair owned Marlinspike Hall before it was purchased by Captain Haddock. In The Secret of the Unicorn, the brothers kidnap Tintin in the belief that he has one of the scrolls, and lock him in the basement of Marlinspike Hall. Tintin escapes, and the Bird Brothers are arrested. Both him and his brother are mentioned in the Castafiore Emrald and have a slight appearance in Tintin and Alph-Art.