“Short-necked Pan”
Late Jurassic, 150 million years ago (uncertain)

This unique sauropod measured only 30 feet in length. It set itself apart from its relatives with its unusually short neck – less than a quarter of its body length. While species like Diplodocus evolved longer and longer necks along the course of the evolutionary arms race, Brachytrachelopan practiced an adaptation strategy commonly known as “giving up.”