Man what a beautiful bit if knowledge, reminds me a bit of the eel mystery. Thanks to the researchers doing this sort of work, and I hope their conservation efforts go well
The falcons were found congregating on an obscure German forum from the early 2000's.
Reading the article, makes me think that mined areas are good for conservation. When the Angolan area where they congregate is demined their numbers might start declining.
What kind of frequencies do these falcon trackers use? Any datasheets available?
Let us build FalconNogs (like Satnogs) with SDRs!
They weren't "missing": GPS-tagged red-footed falcons revealed that they migrate to a tiny communal roost in central Angola (“Falcopolis”) each February–March.
There, saved you a click (disappointed on National Geographic for that clickbaity headline).
https://archive.is/V29Pq