Betta splendens
Betta splendens is a species of freshwater fish in the genus Betta. Bettas are also called  betta fish or Siamese fighting fish. They are called Siamese fighting fish because people used to make them fight each other. Betta splendens are native to Thailand. They are a popular aquarium fish species. They are known for their interesting behavior, bright colors, and ability to breathe air.