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- Extinction is a necessary aspect of the evolutionary processThe Extinction Website: Recently Extinct Animals
- Earth has seen an estimated 5 mass extinctions during its history
- A mass extinction wiped out the dinosaurs approximately 65 million years ago
- Approximately 50% of mammals that have become extinct since the 1800s lived in AustraliaScienceDaily: Surprising Link Between Body Size And Extinction Risk (September 4, 2001)
- Studies show that smaller mammals are less vulnerable to extinction than larger onesScienceDaily: Surprising Link Between Body Size And Extinction Risk (September 4, 2001)
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Over 99% of all animal species that once inhabited the earth are now extinct, meaning that they no longer exist. The Free Dictionary: Extinct Definition Between 1600and 1983, approximately 370 species of animals became extinct and anywhere from 40-100 plant and animal species disappear each day.Biodiversity and Conservation: A Hypertext Book by Peter J. Bryant: Introduction
Human Involvement
Fossil records show that the overall number of species on earth has generally increased over time. However, recent increases in species extinction are believed to have been caused by human interference.The Extinction Website: Recently Extinct AnimalsExtinct Animals
- Dinosaurs
- Mammoths
- Dodo birds
- Saber tooth tigers
- Passenger pigeons
- Eastern Elk
- Aurochs




