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Many thanks to Marcelo de Cruz for the expert guiding around Ushuaia. (birding-in-ushuaia. blogspot.co.uk)
Special thanks to Simon Rowland and the team at Wildfoot Travel (wildfoottravel.com) for facilitating my trip.
David stayed at the Arakur Hotel, Ushuaia arakur.com
Reference guides:
Collins Birds of Southern South America and Antarctica – Martín R. de la Peña & Maurice Rumboll