There a large variety of intelligent beings, besides humans, having created their own cultures, traditions, technology and community. These beings reside not only on the land, but under the sea, in the sky and even in outer space. All of them have developed unique mental and physical adaptations to these different environments.
However it should be known that there are two main categories of beings: Natural: These are those who were born into, and choose to remain, what they are. Artificial: These are those who, after being born, change themselves, either by choice, accidents, circumstances, or through the abilities of Devil Fruits, into something "different". In other words, they are "made" rather than born. Though some races are referred to as humans, they have physical and cultural differences that set them apart.
Races, Tribes and Miscellaneous Humanoids