A US Navy marine mammal handler with a dolphin during a port-security exercise in May 2005.

US Navy/Illustrator Draftsman 1st Class Pierre G. Georges

The US Navy has been training dolphins and sea lions to detect undersea threats since the 1960s. The Navy wants to move away from its marine mammals and use drones and other new sensors instead. But those dolphins and sea lions can still do their jobs better than that new technology.

Since 1959, the US Navy has trained a small force of bottlenose...

Continue Reading For 60 years, the US Navy has been training dolphins and sea lions to keep rivals away from its most sensitive hardware