Assertion: manta ray's brain | /r/HasProperty | warm
Facets:
Source sentences:
text: They have the largest brain-to-body ratio of the sharks, rays and skates (Elasmobranchii), a brain which is kept warm during lengthy dives to as deep as 500 metres (1,600 ft) in cold water.
text: They have the largest brain-to-body ratio of the sharks, rays and skates (Elasmobranchii), a brain which is kept warm during lengthy dives to as deep as 500 metres in cold water.