Otters are known as curious, intelligent and gregarious animals.

众所周知，水獭是好奇、聪明和合群的动物。

The researchers chose these species because they are both social and gregarious animals who regularly make decisions as a group.

研究人员之所以选择这些物种，是因为它们都是群居动物，经常作为一个群体做出决定。