The dodo bird was a flightless bird that was endemic to the island of Mauritius in the Indian Ocean. The bird was discovered by Portuguese sailors around 1507, and the last widely accepted sighting of a dodo was in 1662. The dodo became extinct less than 200 years after its discovery due to a combination of factors, including hunting, habitat destruction, and the introduction of invasive species. The dodo had no natural predators, so it was unafraid of humans, which made it an easy target for sailors who hunted the birds for fresh meat during their voyages. Humans also brought animals, such as pigs and rats, which ate the vulnerable eggs and competed with the dodos for food. Loss of habitat further threatened the birds. Although it is not clear when the last dodo died, it is estimated that they were completely extinct by the 1690s.