Have a look at this amazing range shift, only made visible because you have helped us collect the data that reveal the pattern. Every single atlas checklist is a piece in the big jigsaw puzzle we are slowly but steadily assembling. This map reveals that the Black Sparrowhawk has not expanded its range into the Western Cape, but rather that the entire range has shifted west --- what has been lost in the east (and north) has been gained in the west! --- this is currently the second item of Latest News on the SABAP2 website (and is archived permanently at http://sabap2.adu.org.za/news.php?id=2565) -Great achievement, Team SABAP2. Thanks to Ann Koeslag for her commentary on the map, and there is a link to her one-page hypothesis about why this has happened on the website.
Professor Les Underhill