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| Photo: Harald Süpfle/Wikimedia Commons |
The Social Weavers (Philetairus socius) of southern Africa build communal nests so large that they can pull down mature trees. Each structure can weigh over a ton, and range upwards of 20 feet wide and 10 feet tall, with over a hundred separate nesting chambers. Successive generations refurbish and reuse these compartments, often for more than a century.
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