Larger animals that become invasive on other continents are generally speaking escaped domesticated animals. If kangaroos were suitable for domestication then perhaps they might have been introduced and become established elsewhere.
Pigs and goats are good examples. Feral Pigs are everywhere. Camels and water buffalo are examples of large animals that were introduced to Australia and now live in the wild. They are considered feral. The ecological damage of introduced species in Australia is beyond.
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