Another FF creature gets similar treatment: the Maug entry states "Maugs receive skills as though they were outsiders".
I thought there would be more instances...maybe I'm thinking of other books.
[edit] Just found that 3.0 Treants were handled the same way:
[/edit]Skills: Treants receive skills as though they were fey*. They have a +16 racial bonus to Hide checks made in forested areas.