Clue is - Aquatic Arm what tv programme is this

Walrus and whale are aquatic mammals. They begin with the letter W.

An aquatic larvae is called a naiad, it only holds true for Plecoptera, ephemeroptera, and tricoptera though, I'm not sure what the difference is between a naiad and an aquatic larvae

The word aquatic is always associated with water in some way. Aquatic sports, for example, are any sports that are played in water. Water polo, Marco Polo, water volleyball, and water basketball are all examples. It can be used in a sentence like this: The high school had great aquatic sports teams.

Penguins are aquatic animals as they live in water most of their lives. Likewise gulls, pelicans, albatrosses, and most swans, ducks, and geese qualify.