Some scientists have thought that the noises dolphins make may be a language, for many years now. There is also reserach into Prarie Dog language, whale song, and some of the noises other apes make to communicate.
http://en.wikipedia.org/wiki/Animal_language
Only humans
talk about abstract concepts, in a language other humans understand.
Did you ever read any Terry Pratchett books? My favourite character is You B*stard, a camel who happens to be the greatest mathematician in the world. There isn't much else to do in a desert...
Seriously, if humans started thinking abstract concepts due having more time (the discovery of fire, the advent of farming...) perhaps other animals can or have develop this also. For example, those species of chimps living in communities, and household/farmed animals. I've heard pig farmers say that you occasionally get very pensive, intelligent pigs...