Doug Perrine / Greater crested / Swift tern (Thalasseus / Sterna bergii) large breeding colony on shoreline, rising spring tide floods across the cay, threatening the breeding colonies, Turu Cay, Torres Straits, Que...

Doug Perrine / Greater crested / Swift tern (Thalasseus / Sterna bergii) large breeding colony on shoreline, rising spring tide floods across the cay, threatening the breeding colonies, Turu Cay, Torres Straits, Que...

Doug Perrine / Greater crested / Swift tern (Thalasseus / Sterna bergii) chicks starting to swim across a pond formed as rising tide floods the interior of Turu Cay, Torres Straits, Queensland, Australia. October....

Doug Perrine / Greater crested / Swift tern (Thalasseus / Sterna bergii) adult with creche of chicks on shoreline, Turu Cay, Torres Straits, Queensland, Australia. October.

Doug Perrine / Greater crested / Swift tern (Thalasseus / Sterna bergii) large flock in flight, Turu Cay, Torres Straits, Queensland, Australia. October.

Brent Stephenson / Great Crested Tern (Thalasseus bergii) in breeding plumage, standing on a fishing bouy. Bora Bora, French Polynesia, November.

Brent Stephenson / Great Crested Tern (Thalasseus bergii) in non-breeding plumage. Papeete, Tahiti, October.

Brent Stephenson / Portrait of a Great Crested Tern (Thalasseus bergii) in non-breeding plumage perched on a channel marker. Mangareva, Gambier Islands, French Polynesia, September.

Hanne & Jens Eriksen / Crested / Swift tern (Thalasseus bergii) pair in courtship display, Masirah, Oman.

Dave Watts / Crested tern {Thalasseus bergii} on nest with chick, Australia

Hanne & Jens Eriksen / Flock of Crested terns {Thalasseus bergii} taking flight, Khor Dirif, Oman, June

Steven David Miller / Crested tern (Sterna bergii) Point Quobba, Carnarvon region, Western Australia

Steven David Miller / Crested tern (Sterna bergii) Point Quobba, Carnarvon region, Western Australia

Steven David Miller / Flock of Crested tern (Sterna bergii) Point Quobba, Carnarvon region, Western Australia

Pete Oxford / Crested Tern (Sterna / Thalasseus bergii) Moreton Bay, Queensland, Australia

Hanne & Jens Eriksen / Swift / Crested Tern {Thalasseus bergii} Nafoon, Oman.

Staffan Widstrand / Crested tern colony {Thalasseus bergii} Lady Eliot Island, Australia

Hanne & Jens Eriksen / Crested tern portrait {Thalasseus bergii} Salalah, Oman, June

Richard Du Toit / Crested tern {Thalasseus / Sterna bergii} flying landing with fish, Dyer Is, South Africa

Mark Yates / Crested & Lesser crested terns nesting {Thalasseus bergii & bengalensis} Persian Gulf, Iran

Barry Bland / Greater crested terns (Thalasseus bergii), Penguin Island, Rockingham, Western Australia.

Barry Bland / Greater crested tern (Thalasseus bergii) with wings outstretched, Penguin Island, Rockingham, Western Australia.

Juergen Freund / Crested tern breeding colony {Thalasseus bergii} Layang-layang Malaysia