Aquarium attractions can include a variety of animals, such as seals, whales, OPAH, lionfish, and sea lions. Seals are semi-aquatic mammals that live in the colder waters of the northern and southern hemispheres, and they have four letters in their name. Whales are large aquatic mammals that live in all oceans of the world, and they have five letters in their name. OPAH is a large, colorful fish that lives in tropical and temperate waters, and it has four letters in its name. Lionfish are predatory fish found in the Indo-Pacific region, and they have eight letters in their name. Sea lions are large marine mammals that live in coastal waters, and they have seven letters in their name.