A Sydney-born woman, who calls herself the "Human Swan", has completed a bizarre and dangerous journey from the Russian Arctic tundra to a wetland in western England.

Sacha Dench and her support team were tracking the 7,000-kilometre-long winter migration of Bewick's Swans, a species which has declined in number over the past few decades.

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"It's a fantastic feeling to have touched down safely back in the UK", Ms Dench, who works for the British Wildfowl and Wetland Trust (WTT) said shortly after finishing her trip.

"The Bewick's really are amazing birds and it's been an absolute privilege to accompany them on their annual migration and to play a role in finding out how we can help more of them to make that journey".

The 12-week trip had the backing of world renowned naturalist David Attenborough.

It took Ms Dench over the remote Russian tundra, the forests of Lithuania, the fields of Poland and Germany, and she became the first woman to cross the English Channel in a paramotor.

Along the way she battled injury, snow and storms, and met locals to try to convince them not to hunt the swan.

Her team also tracked several of the birds with radio collars to gather new data about the migration route.

Ms Dench was given an escort during the final leg of the journey over the Cotswolds and a crowd of supporters burst into applause when she landed near the home of the WWT in Slimbridge, Gloucestershire.

Some would call her a fool for flying so far to help save a fowl, but supporters of this so-called "human swan" claim her journey will ultimately help protect their feathered friends.