> Which body part does a whale use to breathe?And the answer: blowhole. Photo credit: MRAUST/ISTOCK/GETTY IMAGES PLUS.Because whales have lungs insteadof gills, they breathe through their noses. A blowhole is at the top of thewhale's head, and it serves as its nostril. When the whale comes up for air, theforcefully expelled air that comes out of the blowhole is in the form of watervapor. When it meets the cooler outside temperature, the vapor condenses andmakes it appear like a spout of water.As some of the largest animals on the planet (and mammals, no less), whales havea unique set of evolutionary qualities that have allowed them to survive andthrive over millenia. When it comes to anatomy, whales are broken down into twocategories based on their physical features: toothed and baleen whales. Baleenwhales have fibrous plates in their mouths that allow them to filter out largequantities of small marine life such as krill and crustaceans. Interestingly, baleen whales have two blowholes instead of one due to theirimmense size. Using two blowholes to breathe in and out allows them to moreefficiently access the oxygen they need to support their massive bodies whileunderwater. Meanwhile, toothed whales tend to be smaller, and filter their airthrough just one blowhole. Toothed whales include species such as orca and narwhal, though massive spermwhales are also on the list. These whales tend to hunt for their food, and areequipped with evolutionary adaptations that allow for extended periods ofholding their breath and/or deep-diving capabilities. Interestingly, the toothedwhale suborder of mammals includes creatures that, really, aren't quite whalesat all. Indeed– this diverse suborder of mammals includes over sixty speciesthat differ widely in size, body design and behavior. From the sperm whale tothe porpoise to the dolphin, toothed whales have found their home in manyvarying marine habitats and are linked through their shared ancestry. To learn more about these fascinating giants of the sea, check out the WorldWildlife Fund[https://www.wwf.org.uk/learn/fascinating-facts/top-10-facts-about-whales] website.