Chervil

Chervil is an officer in the Efrafan Owsla who was Bigwig's second-in-command during the latter's extremely brief stint as an officer himself.

Watership Down (Film)

Sherbil was an extremely smarmy rabbit who was tasked with showing Bigwig around the warren and instructing him in the ways of Efrafa. He was later assigned to guard Blackavar, and he was severely injured when Bigwig attacked him during his escape.