Not sure if there's a pre-exesting thread for somthing like this. but I was thinking... What if an ostrich-like bird evolved with the size, temperment, and intelligence to be domesticated and slowly bred over hundreds of thousands of years by people for the same reasons horses were bred?
Or any other animal for that matter... Obviously there are other factors to consider. Such as the habitat of the proposed birds and the culture of the people that share its environment. Or, somthing like what if the mongols never had horses and just had giant landbirds would be interesting too.
So whats the thought?