Firstable i'm sorry for my english, i am french.
I see in the video on youtube, you can make some breeding. And i am thinking about others animals rarely bring in game. The cat can give a good advantage for secure harvest and dogs can protect from wild animals or help for hunting. A tribe with a tame cheetah can win a great prestige. Some birds, like hawk for hunt, ect.
That just a idea, thank for your game Alex. Hope i can play quickely to your game :) Remenber the first time ,when i have 8 i think, have play to Age of, that was one of my best experience in my life. But you know no presure :)