Measuring the beak of a Great-winged Petrel (Pterodroma macroptera). Mayes Island, Gulf of Morbihan. Kerguelen Archipelago.

pterodroma macroptera natural reserve scientist ornithology head beak measure to close up measuring instrument piscivore indian ocean kerguelen islands fr finger may pterodroma french southern and antarctic lands nature reserve great winged petrel pterodroma macroptera nature reserves nature reserve scientists ornithologist ornithologists ornithological ornithologicals heads beaks measured measuring measuring device measuring devices measuring instruments measuring tool measuring tools ichtyophage piscivores ichtyophagous fingers least concern species environment protection environment management biodiversity management environment scientific research science discipline general morphology organism morphology zoology material diet pattern species world sea and ocean taaf france european union europe iucn red list of threatened species procellariidae procellariiformes aves sauropsida tetrapoda tetrapodomorpha rhipidistia sarcopterygii euteleostomi gnathostomata vertebrata chordata deuterostomia coelomata bilateria metazoa opisthokonta eukaryota petrel pterodroma sp petrel sea bird bird sauropsid vertebrate chordate wild animal animal