We find in their non-verbal communication -- this is very rich -- they have a lot of sounds, which they use in different circumstances, but they also use touch, posture, gesture, and what do they do?
我们还发现，他们的非语言交流非常丰富， 它们会发出各种声音，用于各种不同的场合。 同时，它们也触摸、做姿势，打手势， 那它们是怎么做的呢？