Animals have their own languages.
Humans have decoded the language of some birds:
For centuries, Native Americans have relied on so-called "bird language" to learn the whereabouts of people and other animals that would otherwise remain invisible to the human eye. "A lot of indigenous people have been using bird language to know where mega-predators are," says Pinar Ateş Sinopoulos-Lloyd, co-founder of Queer Nature, who leads courses on bird language. "They are able to decipher how birds communicate and warn each other in the forest."
Popular Science, How to decode the secret language of birds, 2018
Today we know that birds have their own language.
But 1400 years ago the Quran said that birds have their own language:
Solomon learned the language of birds.
The Quran also says that all animals glorify Allah but we cannot comprehend their languages:
[Quran 17.44] The seven heavens and the Earth and everyone in them glorify Him [Allah]; and there is nothing that doesn't glorify Him thankfully; but you (humans) do not understand their glorification. He is Compassionate, Merciful.
How could an illiterate man who lived 1400 years ago have known that animals have their own languages?