The pandemic has made lots of people hopeful birders. The updated Merlin app from Cornell Lab of Ornithology can help ID mystery birds.
allows citizen scientists and local organizations all over the world to log and share bird sightings, including with scientists who study and plot bird populations.
The audio ID component progress was slower than the image ID “just because the routine of going out and recording bird calls just isn’t quite as popular as going and photographing them,” says Van Horn. “But certainly over the last three years or so, North America has been pretty densely covered with audio recordings.”
However, the problem of background noise still remains a challenge for the engineering team. To solve that problem, they turned to existing audio data. These audio datasets could be of traffic scenes, urban environments, and machine noises—in other words, normal sounds that are not from birds. “We would convert those audio into spectrograms and use those as negative examples of ‘this is not a bird; anytime you see this, you shouldn’t be reporting bird species,’” Van Horn adds.
When the app was first launched in 2014, it only had the most common birds of the US and Canada. In 2016, the first international tags were released, starting with Mexico, Costa Rica, and expanding across Europe, Australia, New Zealand, Africa and parts of Asia. “We still see that about 75 percent of our new and active users are in the US and Canada,” says Weber, but a growing number of new species are being logged all across the world.
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