>GPS loggers (13–14 g, 2–3% of body mass; PinPoint VHF-GPS, LOTEK) were attached to the back feathers using waterproof tape (Tesa). The loggers were set to record the geographic position every 15 min and send data via radio communication to the receiver placed within the breeding colony when birds returned from the sea. The tracking duration of the birds ranged from 8.9 to 34.2 days (mean ± S.D.: 24.8 ± 6.8 days).
>GPS loggers (13–14 g, 2–3% of body mass; PinPoint VHF-GPS, LOTEK) were attached to the back feathers using waterproof tape (Tesa). The loggers were set to record the geographic position every 15 min and send data via radio communication to the receiver placed within the breeding colony when birds returned from the sea. The tracking duration of the birds ranged from 8.9 to 34.2 days (mean ± S.D.: 24.8 ± 6.8 days).