Decebal and Darko are two adult male Red-breasted Goose equipped with 18 g Argos Solar PTT transmitters, provided by the Romanian Ornithological Society/BirdLife Romania. The geese were caught on 12 February 2014, near Durankulak Lake (Bulgaria) during the International Red-breasted Goose catching expedition, part of a  LIFE+ project. The purpose of our study is to follow the geese during their 6000 km migration route from their wintering areas (Bulgaria and Romania) to the breeding grounds in Arctic Russia.