Spring is fickle, and each year the season works out differently. This spring, the weather has been extraordinarily dry, with long periods of wonderfully clear blue skies. Ospreys are a sure sign of spring in Denmark. These fish-catching birds of prey arrive in early April, timing their migration with the melting of ice further north. Early this spring, Ospreys trickled by in smaller numbers than expected. Maybe, they passed unnoticed at great height, or maybe, more worryingly, their population had declined. Later in April, however, more observations were made. Inclement weather further south may have simply delayed them by a few days. Ospreys are cosmopolitan birds. They know a thing or two about migration.