Historically, skuas were sometimes included within which other family due to close evolutionary ties?

Answer

The gull family (Laridae)

Historical classifications sometimes placed skuas within the gull family (Laridae) because the evolutionary relationship between the groups is close, although contemporary evidence supports their separation into their own dedicated family.

Historically, skuas were sometimes included within which other family due to close evolutionary ties?
taxonomybirdanimalclassificationSkua