Female gannets travel further than male gannets to find fish for their chicks in some years but not others, new research shows.
Scientists tracked breeding gannets from Grassholm Island in Wales over 11 years with tiny GPS devices and by measuring isotopic signatures in their blood.
Male gannets flew an average of 220km to forage for their chicks, while females averaged 260km. Some birds travelled 1,000km on a single trip.
The scientists also found that the two sexes selected different habitats and foraged at different times of day, but some years they were more in sync. MORE