[aleksei]

Can you point to some to research on the subject? I would think it's not at all clear in which manner animals think, be it in terms of a language or not. Even for humans language may just be a layer on top of thought, and in fact there are those who claim not to think in any specific language.

[gaius]

This is called the Sapir-Whorf Hypothesis if you want to do more reading https://en.m.wikipedia.org/wiki/Linguistic_relativity