Brent Stephenson / White-faced Storm-petrel (Pelagodroma marina) feeding by pattering on the sea surface. Hauraki Gulf, Auckland, New Zealand, November.

David Tipling / Flesh-footed shearwaters (Puffinus carneipes) and New Zealand storm petrel (Fregetta maorianus) feeding in Hauraki Gulf, New Zealand.

David Tipling / White-faced storm petrel (Pelagodroma marina) two in flight, Hauruki Gulf, New Zealand.

Ole Jorgen Liodden / White-faced storm petrels (Pelagodroma marina maoriana) flying over sea, and walking on the water, Chatham Islands, New Zealand

Brent Stephenson / White-faced storm-petrel (Pelagodroma marina) skimming across the surface of the water as it feeds. Off the Three Kings, Far North, New Zealand, March.

Brent Stephenson / New Zealand storm-petrel (Oceanites maoriana) in flight low over the sea showing the upperwing pattern. Off the Three Kings, Far North, New Zealand, March. Critically endangered.

Brent Stephenson / Grey-backed storm-petrel (Garrodia nereis) feeding from the surface of the water. Kaikoura, Canterbury, New Zealand, October.

Brent Stephenson / Grey-backed storm-petrel (Garrodia nereis) in flight bouncing off the water with its long legs. View from behind. Kaikoura, Canterbury, New Zealand, October.

Brent Stephenson / White-faced storm-petrel (Pelagodroma marina) skipping across the surface of the water as it feeds. Hauraki Gulf, Auckland, New Zealand, October.

Brent Stephenson / New Zealand storm-petrel (Oceanites maorianus) bouncing off the surface of the sea as it feeds. Hauraki Gulf, Auckland, New Zealand, October. Critically endangered.

Brent Stephenson / White-faced storm-petrels (Pelagodroma marina) feeding with fairy prions (Pachyptila turtur) over a school of fish. Hauraki Gulf, Auckland, New Zealand, December.

Brent Stephenson / Grey-backed storm-petrel (Garrodia nereis) resting on land. Tuku Valley, Chatham Islands, New Zealand, November.

David Tipling / New Zealand Storm Petrel (Oceanites maorianus) feeding, Hauraki Gulf off North Island, New Zealand

Ole Jorgen Liodden / Black-bellied Storm-petrel (Fregatta tropica) flying in front of surf near Auckland Islands, New-Zealand. November.

Brent Stephenson / White-faced storm-petrel (Pelagodroma marina) in flight low over the water, showing upperwing. Off the Three Kings, Far North, New Zealand.

Brent Stephenson / Grey-backed storm-petrel (Garrodia nereis) hovers above the water whilst it feeds. Kaikoura, Canterbury, New Zealand, October.

Brent Stephenson / White-faced storm-petrel (Pelagodroma marina) skips across the water as it feeds at sea, Hauraki Gulf, Auckland, New Zealand, January.

Brent Stephenson / White-faced Storm-petrel (Pelagodroma marina) feeding by pattering on the sea surface. Hauraki Gulf, Auckland, New Zealand, November.

Brent Stephenson / Grey-backed Storm-petrel (Garrodia nereis) feeding by pattering along the surface. Off Kaikoura, Canterbury, New Zealand, October.

Brent Stephenson / New Zealand Storm Petrel (Pealeornis / Oceanites maoriana) feeding whilst 'walking' on water with wings raised. Hauraki Gulf, Auckland, New Zealand, January.

Brent Stephenson / White-faced Storm-Petrel (Pelagodroma marina) pulling prey from the sea whilst "water skipping" - walking on water with wings raised. Hauraki Gulf, Auckland, New Zealand, February.

Grant Maslowski / New Zealand white-faced storm petrel (Pelagodroma marina maoriana) fledgling, standing on the ground in forest, Rangatira Island, Chatham Islands, New Zealand.

Etienne Littlefair / New Zealand Storm-Petrel (Fregatta maoriana), Hauraki Gulf, January.