Depending on the species, a whale can stay underwater for as few as 20 minutes or as long as 2 hours. Whales are mammals, which is why they must come to the surface of the water to breathe.
Whales are some of the largest creatures in the ocean and exist in a variety of species. All whales give birth and that is one of the reasons why they are classified as marine mammals. Curvier beaked whales are known to look for food underwater for periods that last up to 2 hours. Sperm whales can also stay underwater for 2 hours, while blue whales can stay underwater for an hour.
Whales have several adaptations, including the presence of blubber under their skin, larger arteries and modified lungs. Blubber keeps the whales warm regardless of the falling temperatures in the ocean. Whales feed on small animals like squid and plants that grow under water.
Being very large in size, some whales can make extremely loud noises. Blue whales are regarded as the loudest animals on the planet since they can make sounds that reach up to 188 decibels. Some whale species are considered endangered because of their dwindling numbers and increasing threats.