Extinction in definition are a particular animal or plants species that are now gone off the Earth forever. Natural extinction rates goes at about 1 to 5000 species per year, but currently scientists are estimating that we are losing species at 1000 to 10,000 times the natural rate with dozens of species becoming extinct every day. Since 1900, over 450 more species went extinct including 69 mammal species, 80 bird species, 24 reptiles, 146 amphibians, and 158 fish species. Many species like the western black rhino, baji dolphin, and recently, the Rabbs fringed limbed tree frog went extinct in the 21st century. Top causes of extinction includes habitat destruction, climate change, use of agriculture, poaching/hunting, invasive species and overpopulation of humans