John Cancalosi / Red tailed tropicbird {Phaethon rubricauda} in flight, Antigua, West Indies

Charlie Summers / Golden bosun bird (Phaethon lepturus fulvus) flying over settlement on Christmas Island, Australia.

Luis Quinta / Golden bosun (Phaethon lepturus) Principe Island, UNESCO World Heritage Site, Democratic Republic of Sao Tome and Principe, Gulf of Guinea.

Martin Gabriel / White-tailed Tropicbird (Phaethon lepturus) in flight, Cousin Island, Republic of Seychelles

Martin Gabriel / White-tailed Tropicbird (Phaethon lepturus) on nest, Cousin Island, Republic of Seychelles

Martin Gabriel / White-tailed Tropicbird (Phaethon lepturus), covered with sticky seeds of Pisonia grandis, making the bird unable to fly, Aride Island, Republic of Seychelles

Martin Gabriel / White-tailed Tropicbird (Phaethon lepturus), a ranger removing sticky Pisonia grandis seeds, which made the bird unable to fly, Aride Island, Republic of Seychelles

Martin Gabriel / White-tailed Tropicbird (Phaethon lepturus), chick, Cousin Island, Republic of Seychelles

Robin Chittenden / White-tailed Tropicbird (Phaethon lepturus catesbyi) in flight, Tobago, Trinidad and Tobago, April

Robin Chittenden / White-tailed Tropicbird (Phaethon lepturus catesbyi) Tobago, Trinidad and Tobago, April

Brent Stephenson / White-tailed Tropicbird (Phaethon lepturus) chick still partially covered in down, at its nest. Aride Island, Seychelles.

Brent Stephenson / Red-tailed Tropicbird (Phaethon rubricauda) coming in to land with another flying in the background. Ducie Island, Pitcairn Group, September.