* Dinosaurs: The iconic group of reptiles that dominated the Earth for millions of years went extinct around 66 million years ago.
* Dodo: This flightless bird, endemic to the island of Mauritius, went extinct in the 17th century due to human activity.
* Tasmanian Tiger: This marsupial carnivore, native to Tasmania, was declared extinct in the 20th century due to hunting and habitat loss.
* Golden Toad: This toad, found only in the Monteverde cloud forest of Costa Rica, was last seen in 1989 and is presumed extinct due to climate change and fungal disease.
It's important to note that extinction is forever. Once a species is extinct, it cannot be brought back to life, although scientists are exploring techniques like de-extinction.
