Adult Atlantic puffin (Fratercula arctica) during breeding season on tiny Grimsey Island, Iceland

puffin atlantic fratercula arctica breeding season grimsey island birds summer colorful beaks rocky cliffs nesting behavior seabirds wildlife nature iceland coastal habitat marine birdwatching animal natural environment ocean view ecological balance bird species conservation migratory islands sites cliffside colors enthusiasts ornithology biodiversity avian social ecology adult puffins vegetation colonies ecosystem