LifeMale crossbills grow redder feathers when they exercise harder The red feathers of male crossbills are brighter in birds that find it more physically challenging to fly, suggesting exercise influences plumage colour News
LifeMigrating birds may use slope of Earth’s magnetic field as ‘stop sign’ Eurasian reed warblers migrate to sub-Saharan Africa each year – and they seem to use the slope of Earth’s magnetic field to judge when they have reached their European breeding grounds News