López Gómez, M., Underhill, L.G. and Brooks, M. 2017. Bird distribution dynamics 14 - Pied Avocet Recurvirostra avosetta and Black-winged Stilt Himantopus himantopus in South Africa, Lesotho and Swaziland . Biodiversity Observations. 8, (May 2017), 23: 1 – 10.