【双语参考文本】The forests that lie south of the Black Dragon River are bound up in snow for more than half the year. It's deathly silent.Most of the animals here are either hibernating or have migrated south for the winter.But there is an exception.Wild boars roam the forests of the northeast.Like the Hezhe people, the boars find it difficult to gather food in winter.To survive, they follow their noses, among the keenest in the animal kingdom.(GRUNTING)They will eat almost anything they unearth.But one energy-rich food source is particularly valued. Walnuts.When a lucky boar finds a walnut, there's bound to be trouble.(SQUEALING)But despite the squabbles, wild boars are social animalsand gather together in groups.Staying close together may help them to keep warm in the extreme cold.But there is another reason for group living.More ears to listen out for danger.