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buy tadalafil Such encounters are never guaranteed in Svalbard. Not only are the bears notoriously difficult to spot against the monochrome Arctic landscape, but they are also becoming increasingly rare, and Pat was keen to put this into perspective for us: of the world’s 19 subpopulations of polar bears, eight are declining, three are stable, and only one is increasing, while insufficient data have been collected on the rest. Watching in awe as the animal hauled itself back on to the tundra, we knew how privileged we were to be so close to the world’s largest land predator.