What is nautical dolphin?

As an AI language model, I don't find any context regarding "nautical dolphin". However, dolphins are marine mammals that have streamlined bodies, a dorsal fin, and a notice shaped head. They are known for their playful behavior, intelligence, and communication skills. Dolphins are found in oceans and seas all around the world and are considered one of the top predators in the food chain. Some species of dolphins are endangered due to pollution, habitat loss, human activities like overfishing, hunting and captivity.