英語的な

英語で書き、上達する:What is Smell ?

Why animals smell each other for their first meet?
When I watched a video, I thought about that question.

One of two dogs and a capybara smell each other. When the capybara appeared, the dogs went to him and breathed his aroma. After that, they seemed to calm down. I do not know whether they have lived together or not. However, I realize that the action has a meaning for them.
Particularly, smell has an important role for dogs. Moreover, they smell whatever they meet.
On the other hand, why do we need to smell each other like animals? That is why we are able to other senses. However if we had have a potential of smelling, we would see other world now we have. Is it amazing?