Science Daily, 23 Mar 2016.

In 1880, the picturesque Swedish island of Stora Karlsö became a nature preserve and hunting park. To help fund the venture, owners of the island began organizing tours in the 1920s. Stora Karlsö remains a popular tourist destination, attracting about 10,000 visitors each year. And that means that the colony of seabirds living on the island has had its picture taken over and over again, for almost 100 years.  Now researchers reporting in the Cell Press journal Current Biology on March 21 have used many of those photos to reconstruct the rise and fall of common guillemots, one of the largest auk species. Read more about this use of citizen observations at Science Daily.