Probably one of the same two that's been hanging around this location for a few weeks, now.
Both still on the beach
Two sitting on the beach, occasionally harassing the gulls and terns.
In Poa astonii tussockland.
Harassing an elegant tern
Apparently became quite resident, feeding on fish scraps, on beach at North Pegasus Hut.
Being dive bombed by tern in second photo.
I see NZ Bird has Brown or Subantarctic Skua recorded as Catharacta antarctica.