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They’re meant to work, like we do, but we haven’t found an extraterrestrial species yet that doesn’t understand play. We train them to find things, and they do that. But when they’re not seeking what do we expect? They bring us sticks or balls. When we throw them, they bring them back. It feels natural to us, and to them. And though we’re told not to get attached, just look at their eyes and you can’t help it either. When do they cross the line between a working creature and a pet? When we move their bed beside ours and