A Magical Beast is a creature in the Dungeons & Dragons game noted for it's magical ability and intelligence.
Dungeons & Dragons 3rd Edition
A magical beast is similar to an animal in many ways, but usually has a higher intelligence, and possesses supernatural or extraordinary abilities. Examples include manticores and pegasi. All magical beasts have darkvision out to 60 feet as well as low-light vision; as a group, they have no other special abilities or immunities.