Klaxosaurs are fictional creatures from the anime series Darling in the Franxx. They are large, dinosaur-like beings that pose a significant threat to humanity. These creatures are often depicted as aggressive and are known for their ability to regenerate, making them formidable opponents. In the series, Klaxosaurs are linked to the mysterious origins of the world and the conflict between humans and these creatures. They play a crucial role in the storyline, driving the need for advanced technology, such as the Franxx mechs, which are piloted by humans to combat the Klaxosaurs.