In an alternate universe where Eurasia is less advanced and the native peoples of the Americas and Australia build powerful civilizations, what animals could be domesticated that weren't domesticated in real life?
There are many roles a domesticated animal can be used for. The major ones are farm labor, dairy production, meat production, clothing production, transportation, pets, pest control, egg production, and hunting/guarding. Other animal roles include things like experimentation and sending messages and a few other things I have missed.
An animal needs 3 main qualities in order to be domesticated. Firstly, it must be able to be controlled by humans. It cannot be too large and dangerous. It also cannot easily disrupt human efforts to control it. Secondly, its reproduction should be easily controlled by humans. That way, selective breeding and culling of the unwanted offspring can happen. Finally, feeding this animal must be easy. Ideally, the animal eats things humans don't eat like grass but any animal that overall eats less than a human can work.
So given these qualities, could Aboriginal Australians with Bronze Age Eurasian technology domesticate the Emus or Cassowaries? Emus and cassowaries could effectively serve the role as big chickens by providing eggs, meat, and even clothing and pillows. A similar animal, the ostrich, has also been domesticated. Domesticating cassowaries could be a challenge however due to their sharp horns.