The Monarch Butterfly Migration Explorer uses geotagged photos from Flickr to track sightings of Monarch Butterflies in the US and Canada.
The map allows users to view heat maps of the number of tagged Flickr photos for any year from 2008. Each year's heatmap shows the number of photos up to the current date, so it is possible to compare 2013 with previous years. The difference between the number of monarch butterfly photos taken in 2012 and 2013 looks to be very worrying.
The creators of the map warn that the rise in mobile cameras is likely to have led to an increase in photos over the years.
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