Part of our language development that is unique afaik, is durable language like writing and drawing. That reduces information loss over time and is more transmissible to others.

Undisciplined

Oh, that anonymous dude totally forgot money. Good point!

I don't think any other animal invented something similar to money. Language is pretty common though. Afaik, there is no animal that has not developed some kind of language.

But you probably mean complex language. But are we sure we have good awareness how complex animal language can be? 

Zap to Zero Day 12

We are uniquely gifted at coordinating complex actions across many members of the species. That largely happened because we developed language and money.