Manta rays are large rays belonging to the genus Mobula. Three species are known: M. birostris, the largest at 7 m in width, M. yarae, which reaches 6 m, and M. alfredi, the smallest at 5.5 m. From Wikipedia
The soft robot, developed by researchers at NC State and UVA, achieves 6.8 body lengths per second using a simplified energy-efficient design.
