How many dodo birds existed?

The dodo bird is extinct, so there are no species left. When they did exist, the dodo bird was a single species of flightless, 3 foot tall, fruit eating bird that lived on Mauritius Island in the Indian ocean. The defenseless birds were overhunted by sailors and introduced predators, such as pigs, cats, and dogs, and their nests were raided by macaques and rats. That, along with deforestation, led to their extinction shortly before 1700.