Seems like a pretty big problem that you don't know when any of your data is valid. What if every single whale or cat speaks a different language? It's not like animals have English class.
Also, since chatbots just output "meaningful" strings of tokens based on a string of input tokens, you can build a chatbot that can "talk" to animals without us necessarily being able to understand it. But sure how useful that would be, but interesting nonetheless.
No, but they have parents. I am sure they have taught languages. Just ask any cat lady who will swear their cats understand them.
I'd be more concerned that different regions have different languages and we'd need to control for that.
There could of course be regional languages or dialects in more intelligent social animals just like humans.