Lichen is the staple of their winter diet, and they must push aside the snow to reach it.

地衣是它们冬季食物的主食，而且它们必须把雪推开才能吃到地衣。

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She strike the snow from the branch of an old cedar with gray lichen.

她把长有灰色地衣的老雪松树枝上的雪打了下来。

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She struck the snow from the branches of an old cedar with gray lichen.

她把长有灰色地衣的老雪松树枝上的雪打了下来。

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Brown and sturdy, their antlers silhouetted against the white, the reindeer clear away the snow to reach the food they rely on in winter: lichen.

BBC: Threat to life on Arctic frontline