The shield is enthroned by a silver helmet, on which a white-tailed tropicbird is located above blue and white waves.
22.
Meanwhile, the red-tailed tropicbirds and fairy terns that breed on Ducie are around 1 % of the world population of each species.
23.
The island has a flat profile with cliffs only a few meters from the shoreline, where swallowtail gulls and tropicbirds sit perched in ledges.
24.
Microscopic analysis of eggshell structure by Konstantin Mikhailov in 1995 found that the eggshells of tropicbirds lacked the covering of thick microglobular material of other Pelecaniformes.
25.
The white-tailed tropicbird does not have a yearly breeding cycle; instead breeding frequency depends on the climate and availability of suitable breeding sites.
26.
However, North Keeling is important for breeding seabirds, with sizeable numbers of red-tailed and white-tailed tropicbirds, and sooty terns.
27.
The Morros de Potos?are offshore and is a popular place for snorkeling, with Redbilled Tropicbirds, Brown Boobies and Brown Pelicans nesting on the rocks.
28.
The common noddy and two species of bosun or tropicbirds, with their brilliant gold or silver plumage and distinctive streamer tail feathers, also nest on the island.
29.
Other seabirds breeding there include the white-necked petrel, Kermadec petrel, wedge-tailed shearwater, Australasian gannet, red-tailed tropicbird and grey ternlet.
30.
A few species sport colourful plumes ( such as the tropicbirds and some penguins ), but most of the colour in seabirds appears in the bills and legs.
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