Whales are large mammals that live in water. Like other mammals, whales have a large, highly developed brain and nurse their young with milk. Whales resemble fish in many ways, but they are not. Fish are cold-blooded and breathe underwater using gills. The whale maintains a warm, constant body temperature of about 37 degrees Celsius (about 99 degrees Fahrenheit) and breathes underwater using lungs. Unlike fish, whales move their tails up and down when they swim rather than with a side-to-side motion. Whales can be found in all oceans and seas in parts of the world, rivers and lakes in Southeast Asia, South American tropics, Northern America, and various other parts of the world. Whales are enormous in size compared to other mammals but at the same time, it is also one of the biggest animals living today. There are over seventy- five different species of whales and each species has its own unique characteristics. Now today, I would like to start the presentation off by talking about the different groups of whales and the different species within the groups. Since there are so many different types of whales, I would like to talk about the whales that I believed to be very important.
             Whales are divided into two groups; toothed whales and baleen whales. The toothed whales have jaws lined with simple pointed teeth. These whales actively hunt fish and squid. Toothed whales vary in size from one's that are six feet long to the great sperm whales that average fifty-five feet in length and can weigh nearly fifty metric tons. Among the more unusual toothed species are the narwhal and the beluga, which both inhabit the Arctic waters. From the toothed whales, I will be talking about the beluga whale. The second group known as baleen whales, instead of having teeth, they have mouths lined with giant flexible combs of a material called baleen, or whalebone which is used to filter small fish from the water. There are three types of baleen whales: ...