"Language" in the sense of "the thing only humans have been shown to do" requires a bit more than just one to one correlations between signifiers and objects (or a "sentence" of signifiers with the same meaning as all of the words added together independently). For a system of symbols to be "language" there must be a difference between "what the cat ate" and "what ate the cat". No animal communication has been shown to have a grammar to it, and thus the ability to express exponentially many unique ideas with each additional word.