It was all harmless fun at first for Baker, a squirrel monkey, and her space travel companion, Able, a rhesus monkey, in the run-up to their 16-minute space flight on May 28, 1959. But the trip ...

Squirrel monkeys are becoming an important symbol for wildlife in Costa Rica. They delight researchers who study them, and weighing in at just one and a half pounds, with beautiful orange fur and ...