A pair of alert seabirds sit on the edge of a cliff with each other in a seabird colony with turquoise water in the background on Handa Island, Scotland

scotland handa island alca torda razorbill seabird flapping wings flying ocean watching nature biodiversity avian flu bird flu h5ni birds black and white sea marine aquatic maritime flap fly breast feather alert wildlife wild remote inaccessible cliff sea cliff rocks guano environment ecology biodiversity crisis climate change ledge shelf niche plumage plume couple pair preen thrift clifftop landscape