贝科夫认为“这是一项伟大的研究，也是第一项真正关注狼类的生物学研究”，它考察了狼的自然习性。
"It's a great study and the first, I think, that really is really biologically relevant to wolves," meaning that it tests their natural propensities, says Bekoff.
他们的工程名为Shadowland Foundation，包括一系列重点介绍狼类情况的活动，以及通过亲身体验认知自然的教育活动。
Their program, the Shadowland Foundation, involves a variety of activities to highlight the plight of wolves and educate about nature through first hand experience.
狼的叫声分为四类：狂吠，呜咽，嚎叫和咆哮。
Wolves' vocalizations can be separated into four categories: barking, whimpering, growling, and howling.
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