It depends what you mean by language. I think you're using a very narrow definition in your comment. We already have evidence that some whales use sounds to ide

It depends what you mean by language. I think you're using a very narrow definition in your comment. We already have evidence that some whales use sounds to identify other whales, i.e. "names". We also have building evidence that their vocalization contains some sort of words. If you expand language beyond spoken language, there is evidence of clear communication of complex data, like bees explaining others where to find food with basically little dance moves. A large part of our "intelligence" is actually the ability to not needing to know everything, because we live in a society. I don't need to know how to build a vehicle or how it works to be able to learn how to drive it. Most animals don't have that luxury. And an important requirement for that is being able to communicate complex ideas with your peers, and pass them on to the next generations. Maybe if intelligence alien life is completely different than what we find on Earth, this isn't necessary. Like if they don't live in the same plane of existence. But if it is comprised of physical conscious individuals, it's highly likely that they would have some sort of language.