The majority of dragons are divided into two types: flying Western dragons (derived from diverse European folk tales) and Eastern dragons (derived from the Chinese "long" dragon). Dragons figure in several legends all throughout the world. They often are depicted as dangerous creatures that live in caves or underground, but some are said to be able to talk with humans. Dragons have been a part of Asian culture for thousands of years. In China, dragons are considered ancient creatures that date back over 2,000 years. Even today, people think that dragons are still living in certain mountains of China because they see smoke coming out of cave mouths when they hike in these areas. In Japan, dragons are called karas. They belong to a family of large carnivorous reptiles known as saurians. There are three main varieties of saurian in Japan: horned, flat, and scaly. The word "dragón" comes from the Japanese word for dragon, kara. Karas have been used in entertainment including in martial arts films. In India, dragons are called nagas. They are serpent-like creatures that live in water bodies such as lakes and rivers. Nagas can grow to be 20 feet long and weigh more than 500 pounds. They have four legs and a tail, and some have wings too.