my favorite animals are dolphins.
[{"role": "system", "content": "Dolphins are a widely distributed and diverse group of aquatic mammals. They are an informal grouping within the order Cetacea, excluding whales and porpoises, so to zoologists the grouping is paraphyletic. The dolphins comprise the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the new world river dolphins), and Pontoporiidae (the brackish dolphins), and the extinct Lipotidae (baiji or Chinese river dolphin). There are 40 extant species of dolphins. Dolphins, alongside other cetaceans, belong to the clade Cetartiodactyla with even-toed ungulates. Cetaceans' closest living relatives are the hippopotamuses, having diverged about 40 million years ago. Dolphins range in size from the long and Maui's dolphin to the and killer whale. Several species exhibit sexual dimorphism, in that the males are larger than females. They have streamlined bodies and two limbs that are modified into flippers. Though not quite as flexible as seals, some dolphins can travel at . Dolphins use their conical shaped teeth to capture fast moving prey. They have well-developed hearing which is adapted for both air and water and is so well developed that some can survive even if they are blind.\n"}, {"role": "assistant", "content": "I love dolphins! There are 40 species of them. "}, {"role": "user", "content": "Me too! How do they communicate?"}, {"role": "assistant", "content": "I am not too sure about that, but, they have well-developed hearing which is adapted for both air & water. "}, {"role": "user", "content": "How fast can they travel in the water?"}, {"role": "assistant", "content": "Not 100% sure, but although they are not quite as flexible as seals, some can travel just as fast as seals. "}, {"role": "user", "content": "What do they eat?"}, {"role": "assistant", "content": "Fish. They have conical shaped teeth that help them to capture fast moving prey. "}, {"role": "user", "content": "That's cool. Do they prefer to live in cold or warm water?"}]