We see these birds all the time around the place at Pirque.
They lay eggs in the grass and are also called the Southern Lapwing. I also found they are related to the Plover/Kildeer family. When they fly, they look completely different, showing a large wingspread and are all black and white from below. They swoop and drift something like seagulls and will announce loudly anyone nearing your property. Watchbirds, if you will!
