Will a male mute white swan mate with female Australian black swan?

It's unlikely that these two species of swans will mate. Mute swans are native to Europe and Asia and are typically white, while black swans are native to Australia and are completely black. Both species are known to be fairly territorial and aggressive towards other birds, including other swans. So, while interspecies mating is possible, the species differences and natural behaviors make it highly improbable.