Reef manta ray (Manta alfredi)WIKIMEDIA, SHIYAM ELKCLONER
The mirror self-recognition (MSR) test is commonly used to evaluate nonhuman animals’ self-awareness, and has been reportedly passed by several mammals and birds including apes, elephants, dolphins, and magpies. According to a study published earlier this month (March 11) in The Journal of Ethology, there’s now evidence to add manta rays to that list.
“Manta rays are likely the first fish species found to exhibit self-awareness, which implies higher order brain function, as well as sophisticated cognitive and social skills,” study coauthor Csilla Ari told X-Ray Mag.
Observing two rays in a tank at the Atlantis Aquarium in the Bahamas, the researchers noticed that the animals changed their behavior when a mirror was placed on one of the walls. New behaviors included apparently checking out ...