Assertion: porcupine caribou | /r/HasProperty | annual land migration
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text: Porcupine caribou's (R. t. granti) 1,500 miles (2,400 km) annual land migration between their winter range in the boreal forests of Alaska and northwest Canada over the mountains to the coastal plain and their calving grounds on the Beaufort Sea coastal plain, is the longest of any land mammal on earth.