The Dodo

The dodo (Raphus cucullatus) was a flightless bird endemic to the Indian Ocean island of Mauritius. Related to pigeons and doves, it stood about a meter (3.3 feet) tall, weighing about 20 kilograms (44 lb), living on fruit, and nesting on the ground.

The dodo has been extinct since the mid-to-late 17th century. It is commonly used as the archetype of an extinct species because its extinction occurred during recorded human history and was directly attributable to human activity. 

In the year 1598 AD, Portuguese sailors landing on the shores of the island of Mauritius discovered a previously unknown species of bird, the Dodo. Having been isolated by its island location from contact with humanity, the dodo greeted the new visitors with a child-like innocence. The sailors mistook the gentle spirit of the dodo, and its lack of fear of the new predators, as stupidity. They dubbed the bird "dodo" (meaning something similar to a simpleton in the Portuguese tongue). Many dodo were killed by the Dutch during their brief occupation of the island, and those that survived man had to face the introduced animals. Dogs and pigs soon became feral when introduced to the Mauritian eco-system.

The phrase "dead as a dodo" means undoubtedly and unquestionably dead, whilst the phrase "to go the way of the dodo" means to become extinct or obsolete, to fall out of common usage or practice, or to become a thing of the past.