Why in your opinion is it difficult for us human beings to accept that animals actually do communicate in a language?

We humans like to think that we are special and that we are somehow separated from the rest of the animals. If we allow the possibility that animals have language, in the minds of some people that makes us seem less special and less separate. My answer is that we are indeed special, just like every other species is special in its own way.

How do animals communicate with each other according to scientific research?

There are many different ways that animals communicate with each other. Some of these ways we're just beginning to find out about because they seem so strange to us. Animals communicate using vision, sound, odors, touch, taste. But other ways that we are finding out that animals can communicate involve other senses, such as detecting electrical fluctuations and magnetic fields.