It?s 9 o?clock on a June morning in a muggy tropical forest not far from Brazil?s Atlantic coast and brown howler monkeys have been roaring for an hour. But the muriquis?the largest primates in the Americas after human beings, and the animals that the anthropologist Karen Strier and I have huffed uphill to see?are still curled high in the crooks of trees, waiting for the morning sun to warm them.
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