I'd happily add birds to the list. I had a budgerigar which lived for ~12 years. She had very personal traits. For example she always sat silent until she saw m

I'd happily add birds to the list. I had a budgerigar which lived for ~12 years. She had very personal traits. For example she always sat silent until she saw my eyes open, regardless of the hour. She always knew that I was the one I opened the door and sang very happily, again regardless of the time of the day. She liked to troll me and my parents. She ate the corners of my lecture notes, esp. if I didn't pay attention to her (exam periods), flicked a single CD from the stack, grabbed and threw down, studied how it fell, and chirped at me head sideways, trying to tell "look, I did something". I could write tons and tons of things where she was very aware of my emotions and responded to it, or communicated with my parents in their own way. So, I don't think it's limited only to "more complex" animals like dolphins, dogs, and elephants. Cats and birds (oh, look at cockatoos, crows magpies, etc.) are also in that group as well. Cockatoos raid trash bins and find ways to open even the blocked ones if their strength allows. Lastly, here's a parrot which trolls its owner and laughs about what it did! Oh boy, it's aware of what it did [0]. [0]: https://www.youtube.com/watch?v=YLNSaQCDl8E https://www.youtube.com/watch?v=YLNSaQCDl8E