Dolphins are known to be one of the smartest animals on the planet—possibly because they can conserve their brain power.
Dahil nagkalat o naglisaw sa ilalim ng dagat ang mga predators at mga wild animals na naninirahan sa laot, the marine mammals have developed a neat trick of maintaining partial consciousness even as part of their brain sleeps.
At ayon mismo sa mga reasearcher, ang mga Dolphins ay natutulog na nakabukas ang isang mata (half sleep).
At kahit ginagawa nila ang ganyan araw-araw, ang kanilang nocturnal alertness ay constantly tested, they’ve remained as alert and perceptive as ever.