The Mystery of Kangaroo Adoptions

When you spend five years watching kangaroos, you start to see some strange things. From 2008 to 2013, Wendy King, a biologist at Bishop's University in Quebec, and her colleagues studied wild grey kangaroos in a national park in Victoria, Australia. All told, King and her colleagues studied 615 animals--194 adult females, and 326 juveniles, known as joeys. The first time King and her colleagues captured each kangaroo, they took a number of measurements and then marked it so they could recognize it later. From time to time, they'd find a juvenile kangaroo in the pouch of a different mother. Sometimes it would climb out, but then it would climb back into ...

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