Natural History Wanderings

The Gardian reports

‘Fascinating’ discovery could prove a useful non-invasive diagnostic tool to apply to other species,

The vivid blue irises of northern gannets turn black if they survive avian flu, according to a study which provides evidence that some wild birds are shaking off the deadly virus.

Read more at Irises of gannets that survive avian flu turn from blue to black, study finds | Birds | The Guardian