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In the Kalahari Desert, where the border of South Africa intersects with both Namibia and Botswana, is a transfrontier park - no passports needed as you weave from one country into the other and back. It's also home to a finch-like bird, a common, completely endemic resident. It's pale bill and black face distinguish it from other weavers. The communal nests it builds in thorn trees are the largest in Africa - and will often breaking down the trees. Alongside the road to the park I saw several nests built on telephone poles, making the poles look like huge mushrooms. The only other weaver to build communal nests are Red-billed buffalo weavers, which build small colonies of several communal nests in baobobs or acacia trees.