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Where Sloths Find These Branches, Their Family Trees Expand

For almost ten years, Jonathan Pauli and M. Zachariah Peery, professors at the University of Wisconsin, and their colleagues have been tracking a group of sloths in Costa Rica. The animals are equipped with radio collars that transmit their location five or six times a month, so the team knows where each sloth’s usual territory is. The team has also taken DNA samples and figured out the sloths’ family tree, so they can tell which individuals are having the most babies.