The term BARKING MAMMAL can be solved by the four-letter word SEAL. Seals are semi-aquatic mammals that live in the ocean and on land. They are known for their loud barking vocalizations, which they use to communicate with each other. Seals are found in many parts of the world, including the Arctic and Antarctic regions. They have a thick layer of blubber that helps them stay warm in cold water. Seals are also known for their agility and grace in the water, as they are able to swim quickly and maneuver around obstacles.