I have 2 cats, and they both have a very similar language to what you described. For example, the "lonely" call is one mine do regularly when they want the oth

I have 2 cats, and they both have a very similar language to what you described. For example, the "lonely" call is one mine do regularly when they want the other to join them. One will let out a mournful yowl from the other side of the house and the other will swiftly join them for cuddles / playtime. The "frustrated by inaccessible prey" is another interesting one to hear because of how unique it is. You described it perfectly! Like you, I'm convinced that they have a specific lexicon of meows that allows them to both communicate verbally and when they're close to each other they use more non-verbal methods of communication.