The Karukinka natural park on Chile's side of the Tierra del Fuego archipelago guards a treasure trove of ancient beech trees saved from the chainsaws of loggers. Today, the leafy giants face a new threat: a flourishing community of beavers brought to Patagonia from Canada 75 years ago with the idea of promoting human settlement, centered on fur trade, on the sparsely populated tip of South America.

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