Is the ability to learn language innate or learned?

I saw a Geico ad the other day, one of the ones with the cavemen, and it got me thinking how humans came up with language. Were we born with a way to communicate? Well sure, we have vocal chords and such, but don't animals have those too? So maybe animals are born with the ability to communicate too, like the songs whales sing to each other, or the noises dolphins make. I think with this new view that the ability to learn language is innate, but has evolved over time. We weren't born speaking English or Spanish, but our brains evolved and the tool of communication became innate.