They were booted from their habitats by New Zealand's timber industry, which planted so much imported Monterey pine that 7% of the country now is covered with it.

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Ahead of them a horse whinnied in the timber and then, through the brown trunks of the pine trees, only a little sunlight coming down through their thick, almost-touching tops, he saw the corral made by roping around the tree trunks.

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Behind the velodrome's timber-clad frame, cyclists will race for gold round a track made from sustainably-sourced Siberian pine, while Zaha Hadid's striking wave-shaped roof on the Aquatics Center has been temporarily adorned with "wings" providing seating for 15, 000 spectators.

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