The tulkun whales, also known as "the great beasts," are a species of giant aquatic creatures that appear in the movie "Avatar: The Way of Water." These creatures are native to the planet Pandora, and play a significant role in the film's story.

In the movie, the tulkun whales are revered by the Na'vi people, who consider them to be sacred and important to the balance of their ecosystem. The tulkun whales are also believed to be connected to the planet's spiritual energy, known as "Eywa."

The tulkun whales are characterized by their massive size and distinctive appearance, with long, slender bodies and large, flat heads. They are covered in shimmering blue-green scales, and have multiple rows of sharp teeth. The tulkun whales are also capable of making a variety of vocalizations, including deep, rumbling calls that can be heard over long distances.

In the movie, the tulkun whales play a crucial role in the conflict between the Na'vi and the human forces that have arrived on Pandora. The tulkun whales are able to communicate with the Na'vi through their spiritual connection with Eywa, and provide them with important information and guidance.

Despite their importance to the Na'vi, the tulkun whales are threatened by the actions of the human forces, who seek to exploit Pandora's resources and disrupt the balance of the ecosystem. In the end, the tulkun whales are able to help the Na'vi triumph over their enemies, and restore balance to Pandora.

Overall, the tulkun whales are a fascinating and important part of the "Avatar: The Way of Water" movie, and their role in the story helps to illustrate the interconnectedness of all living things on Pandora, and the importance of preserving the balance of the planet's ecosystem.