Details: This poster shows two whales, some fish, a dolphin and an octopus in an underwater ocean scene.
Whale is the common name for marine mammals of the order Cetacea. The baleen whales are characterized by baleen, a sieve-like structure in the upper jaw made of keratin, which they use to filter plankton from the water. The toothed whales use sharp teeth and prey on fish, squid, or both. A fish is any aquatic vertebrate animal that is typically ectothermic (or cold-blooded), covered with scales, and equipped with two sets of paired fins and several unpaired fins. Fish are abundant in the sea and in fresh water. Dolphins are marine mammals that are closely related to whales and porpoises. The octopus (from Greek eight-footed ) is a cephalopod of the order Octopoda. An octopus has eight arms, which trail behind it as it swims.