π¦ Oilbirds ditch the cave for long food runs
Scientists tracked 21 oilbirds in Venezuela, observing three distinct movement strategies among them. Five birds became intra-tropical migrants, staying away from the main cave for 17 to 73 continuous days. These long-distance travellers spent an average of 2.26 hours flying nightly compared to 3.28 hours for roost-faithful birds. This nomadic movement likely reduced the required daily flight effort between roosting and feeding spots. The study, conducted from August 22, 2008, to February 14, 2009, used GPS and accelerometers to track their activity. π¦