Amazing! These migration patterns must be compiled from all of the observations that their app is used to identify; these kinds of crowd-sourced data products have the potential to change the way migration patterns are studied. I hope they are accounting for sampling bases, and cross checking with observation stations.<p>I help Copper Country Audubon [1] take data for similar studies at a much smaller scale in the Lake Superior region.<p>[1]: <a href="https://www.coppercountryaudubon.org/" rel="nofollow">https://www.coppercountryaudubon.org/</a>