另一个很重要的因素是动物的群居性有多大。
Another factor is that appears to be very important is how social the animals are.
海豚是一种群居性动物，会通过尖叫声和呼噜声相互沟通。
Dolphins are social animals that communicate with each other through squeaks and grunts.
在哺乳动物中，它的与众不同之处在于它既是群居性的，也实行一夫一妻制。
What makes it unusual among mammals is that it is both sociable and monogamous.
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