Not too many years ago language was defined as "a spoken or written means of communication." Back then American Sign Language wasn't considered a real language since it was neither spoken nor written, so very few people who weren't Deaf or related to someone who was knew ASL.
Now that lots of people can study that language in school life is easier for Deaf people.
And even animals have languages. I read a fascinating book by Stanley Coren called How To Speeak Dog about dog communication.
We once had a Deaf Dalmation who learned to understand over 300 ASL signs (mostly names of people or animals, places, and foods) and all her signs are in that book. I have a story about her in a Chicken Soup For The Soul Book, I Can't Believe My Dog Did That.
I also once met and had a very short conversation with Koko, the gorilla who learned Sign Language.
But lots of other creatures have languages. The birds and the bees are only a few of them.
Communication is essential to all of us.