Have you ever heard someone use the term "dead as a dodo"? The dodo this saying
refers to was a flightless bird species that lived on an island in the Indian Ocean.
The bird, which weighed about 46 pounds (22 kilograms), first encountered humans in the 16th
century. Inhabitants of the island found that they could easily hunt and kill the dodo,
both for food and for sport. By 1681 there were no dodos left on the island or anywhere
else in the world. They had become extinct.
People often associate the word "extinct" with dinosaurs, which have not lived on Earth
for more than 66 million years. But there are many creatures, like the dodo, that have
only recently become extinct.