Simplify the following text for a Grade 8 native English-speaking person.
Original: Thirty species of whales , dolphins , and porpoises have been recorded in the Great Barrier Reef , including the dwarf minke whale , Indo-Pacific humpback dolphin , and the humpback whale .
Simplified: Thirty species of whales , dolphins , and porpoises have been seen in the Great Barrier Reef . This includes the dwarf minke whale , Indo-Pacific humpback dolphin , and the humpback whale .