A key outstanding issue in adaptive evolution is the relationship between the genetics of intraspecific polymorphism and interspecific evolution. Here, we show that the pale/dark ventral plumage ...

The Arctic Skua is a seabird that is polymorphic for dark, intermediate and pale phenotypes of plumage. The melanic, dark and intermediate males can find mates sooner in the breeding season than the ...

DATA have recently been collected in Caithness and Shetland on the numbers of the different mating types, dark × dark, dark × pale and pale × pale, of the colour phases of the Arctic skua, ...

Quantifying within- and between-individual variation in animal migration strategies is a first step towards our understanding of the ability of migrants to adjust to changes in the environment. We ...

A DRAMATIC chase is afoot between two seabirds above the icy waters of north-east Norway in the image below. In a sly plan to steal a fish, an Arctic skua (Stercorarius parasiticus) tails a ...