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Cover image Pair of Eastern High Arctic Light-bellied Brent Geese landing to forage on exposed green algal beds at low tide in Northern Ireland, just weeks before undertaking the northwards spring migration to Iceland. The ringed bird (ZZww) is a member of a pair without any young that winter and one of a total fl yway population of 35,000 and one of over 5,000 marked birds for which we have long life history data. Credit: Kendrew Colhoun. See the paper ‘Measures of oxidative state are primarily driven by extrinsic factors in a long-distance migrant’. Biol. Lett. 20180750. (http://dx.doi.org/10.1098/rsbl.2018.0750).

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