AnimalsVersión en línea Ask for clues and guess the animal! por Lau De Jesus 1 They are mammals Pistas 1 They breath through a nose or nostril on the top of their heads. This is called a blowhole 2 They don't sleep because they need to be awake to breathe. Half the brain is awake and half goes to sleep 3 It weighs as much as 6.000 children. It is the largest animal 4 Some of them can dive under water for five hours 5 They aren't fish 6 Most whales live for about 40 years, but some species can live for over 100 7 Some types of them can communicate by "singing" 8 Some of them hunt for food in cold water, but migrate to warmer waters to give birth