Rob Drummond/ BIA / Great-winged Petrel (Pterodroma macroptera) flying, Victoria, Australia

Brent Stephenson / Adult Grey-faced petrel (Pterodroma gouldi) flying at sea, showing the pale face and underwing pattern. Hauraki Gulf, Auckland, New Zealand, October.

Brent Stephenson / Adult Grey-faced petrel (Pterodroma gouldi) sitting outside its nesting burrow at a breeding colony. Cuvier Island, Coromandel, New Zealand, August.

Rob Drummond / Great-winged Petrel (Pterodroma macroptera), Victoria, Australia

Brent Stephenson / Grey-faced petrel (Pterodroma macroptera gouldi) in flight against the sea, showing upperwing. Off the Three Kings, Far North, New Zealand. March.

Rob Drummond/ BIA / Great-winged Petrel (Pterodroma macroptera) flying, South Australia, Australia