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Definition: Rheiformes are a group of animals that have a backbone, which is not like fish's backbone. They also have a long neck and forelimbs with short arms. This group includes birds, reptiles, and mammals.
Definition: The term "rheiformes" is a genus of mammals in the family Cetacea. These are marine mammals that are closely related to dolphins, porpoises, and whales. They have long bodies with large ears and a streamlined body shape. The main distinguishing features between these animals include their long necks, which they use for breathing, and their strong jaw muscles. The genus "rheiformes" is named after the Greek word for "to feel," meaning that these marine