Language specifically means manipulating symbols to convey abstract information. It's not the same as using simple signals to communicate. Dogs barking, African wild dogs sneezing, birds singing, frogs bellowing, cuttlefish changing skin color, all those things are communication. But they can generally only convey one specific piece of information. Communication becomes language when you can combine symbols to convey abstract meaning.

One example of the difference between animal communication and language - A lot of animals can say "There is danger". But they can't say "There is danger over there" or "There was danger" or "there will be danger" or "There is danger behind you". They have a signal for danger, but they can't combine that signal with other abstract ideas to convey more detailed information. They can't talk about something that isn't present, ie "I saw danger there last week".

https://en.wikipedia.org/wiki/Language#Distinctive_features_of_human_language

Basically, what we're doing is vastly, vastly more complicated and flexible than what we've observed in any animals to date, to the point where using the same term for human language and animal communication is more misleading than helpful. And like I mentioned - We're starting to find instances where some animals may be doing some language like things, but to date we haven't ID'd anything that can really be termed language in the way that humans use it. That doesn't mean there isn't a lot of complex communication going on, but so far what we've found doesn't work the way human language does or use the same features.

Something to think about - Langauge requires a lot of very specific cognitive processes tied to specific parts of the human brain. People can, and do, lose the ability to use language all the time. Conditions like aphasia result in the inability to use words. Folks can still think just fine, but somewhere between the thinking and the making speech something is broken. And there are many, many other conditions that can impair language use. One way to learn about a thing is to observe it when it breaks. Humans are very specialized in language usage, but we can lose that ability relatively easily. Most other animals never had it at all, lacking the highly specialized brain structures that humans use for that purpose.