Per Alström är professor i ekologi och genetik och har i sin forskning kartlagt hela sju nya fågelarter.

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There's an app that can identify bird species from their song or even by photo:
Merlin. Developed by Cornell Lab of Ornithology, and covers birds across most of the world. Thanks to Helen Fields for the tip.
Big downside - the app won't start until you provide an email address. It appears it won't continue working past five days unless the email address is confirmed. Why are you being snoopy, Cornell? Not nice.