There are 49 million kangaroos in Australia. There are 3.5 million people in Uruguay. If the kangaroos were to attack Uruguay each person would have to fight 14 kangaroos.
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It depends how the kangaroos get to Uruguay. Say there are twenty scheduled flights per day x 300 kangaroos per flight, that's only 6000 kangaroos per day. If the Uruguayans lie in wait at the airport, every kangaroo will have to fight 583 Uruguayans. If I was a kangaroo I wouldnt fancy those odds.