Bryan and Cherry Alexander / Chinstrap penguins (Pygoscelis antarctica) on a blue iceberg, with Antarctic Prion (Pachyptila desolata) flying over. Antarctica

Brent Stephenson / Fairy Prion (Pachyptila turtur) in flight low over the sea surface showing upper wing. Hauraki Gulf, Auckland, New Zealand, October.

David Tipling / Antarctic prion (Pachyptila desolata) in flight over Southern Ocean off South Georgia, January

David Tipling / Antarctic prions (Pachyptila desolata) flying over Southern Ocean off South Georgia, January

David Tipling / Antarctic Prions Pachyptila desolata Southern Ocean off South Georgia

Brent Stephenson / Antarctic prion (Pachyptila desolata) taking off from sea, South Atlantic, January.

Brent Stephenson / Antarctic prion (Pachyptila desolata) flying just over sea surface, South Atlantic, December.

Dave Watts / Fairy prion (Pachyptila turtur) on ground, Tasmania, Australia.

Ole Jorgen Liodden / Fulmar prion (Pachyptila crassirostris crassirostris) in flight near Bounty Island, Sub-Antarctic New Zealand, March.

Eric Sohn Joo Tan / Fulmar Prion (Pachyptila crassirostris) flying, New Zealand

Brent Stephenson / Antarctic prion (Pachyptila desolata) in flight low over the sea, showing upperwing pattern. Between the Falkland Islands and South Georgia, South Atlantic. January.

Brent Stephenson / Antarctic prion (Pachyptila desolata) taking off from the sea, showing underwing pattern. Off South Georgia, South Atlantic. January.