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By Megan Rose Dickey,
San Francisco hosts a variety of birds, and a new app helps people spot them.
What's happening: Birda , a free app and social media platform, launched in September to encourage people to bird-watch.
Why it matters: Bird populations in the U.S. have dropped by 3 billion since 1970, and more than half of all U.S. bird species are in decline, Axios' Deirdra Funcheon reports .
If you start: There are a number of places throughout San Francisco to go bird-watching.