Male Atlantic puffin gives his mate nesting material. Today is a "leap day". "Nest-building Western Puffins", Skomer Island, England This year is a leap year after every four years. In the past, in the UK, proposals from women to men were only accepted on leap days, and men were supposed to be able to refuse proposals ... So, from the UK, Skomer Island, a proposal for a rainbow trout? I will deliver the state of. This is actually nesting, not proposal. They perform courtship activities from spring to summer and nest in the same place every year. Males and females take turns heating eggs, and they're terrible friends. (© Danny Green/Minden Pictures)