When two friendly cats meet, they rub their noses, head and whole body against each other and purr silently. - Enraged male walruses stand up, show each other their long sharp tusks and roar loudly. - And the defenseless lioness whines and wails piteously when she is afraid of something. - Animals cannot communicate with each other with words like we humans do, but they have their own language. They can be happy, they can get really angry and they can also be afraid. And they express all this with their body.