When a body of water or air moves in one direction, especially through another body of water or air which isn't moving as much. The ocean current is caused by a lot of different things, including the movement of the earth, the weather/wind, differences in temperature in different parts of the world, and the pull of the Sun and the Moon on the Earth.

Echolocation is a process for locating distant objects by sending out sound waves which are then reflected back to the sender.

A fish with a flattened diamond-shaped body, and a long, poisonous, barbed spine at the base of it's tail.

A pod, or kauika in Māori, is a small group or school of marine animals, such as whales or dolphins.

When the surface of the ocean rises and falls twice a day because of the movement/attraction of the sun and the moon.

Orca, or maki and kākahi in Māori, are also known as ‘killer whale.' They are a large black and white 'toothed whales' that are actually the largest member of the dolphin family. Orca are apex predators, which means no other animal in the sea hunts and eats them. They have a large dorsal (back) fin and live in groups that hunt seals, fish, and penguin together. They can be found all over the world, including in New Zealand waters.