I've used in in the past when I was in Texas.
It helps to track bird populations as it allows people to post their sightings
online and then numbers and species of birds can be tracked. It could be a
little more user friendly, in that it is not so easy to list birding spots (you
need to know GPS coordinates for places, I believe), but other than that, since
it's affiliated with Cornell's Lab of Ornithology (where there are some great
birders, some of whoim I've birded with), it's very good.
Just my two cents,
Richard
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