Trees of the same type growing in the same area grow at the same rate. Whales Students used color flags to compare the sizes of different species of whales and other animals to each other. Students learned that toothed whales are relatively small in comparison to the baleen whales. Students also examined a variety of whale bones and baleen. Cetacea is the scientific name given to the group of animals known as whales.
Whales occur in all the worlds' oceans.
Some cetaceans spend their lives in freshwater rivers and lakes. Cetaceans are divided up into two groups according to what they have in their mouth. These are known as baleen whales. Other whales have teeth in their mouth. These are known as toothed whales.