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Arctic Tern (Sterna Paradisaea), Northern Friesland
Every year the arctic Tern undertakes the longest known migratory journey in the animal kingdom, flying a 70,000km round trip between Greenland and Antarctica. The birds weigh a mere 100g and travel South to spend 4-5 months in the pack ice. The birds arrive at the nesting site while there is still snow on the ground and wait for the melt before nesting. They may even refrain from nesting at all in years of a late thaw. The nest is made up of moss and shell and contains a couple of small eggs, lain in a small scrape in the ground, making them susceptible to the Arctic Fox and other predators.