For every species that is alive today, perhaps a thousand more have lived previously and become extinct. Most of these extinctions occurred before humans evolved, and the species are known to us only through fossils
The dodo was a large (50 lb) flightless bird that lived on Mauritius, an island in the Indian Ocean. It lived undisturbed for so long that it lost its need and ability to fly. It lived and nested on the ground and ate fruits that had fallen from trees. The island was uninhabited and the dodo had no natural predators. Then Mauritius was colonised in 1638. Dodos were hunted for food and easy to catch because they were not afraid of people. New competitors were brought onto the island …show more content…
Answer the following questions using information from the text: 1. Out of the four causes of extinction we have learnt about, which one caused the extinction of the Dinosaurs and why?
2. Why can we not know for sure what killed the dinosaurs?
3. Write brief notes on each of the above environmental theories of dinosaur extinction.
The Tasmanian Tiger-Wolf
Was Thylacinus cynocephalus a wolf or a tiger? It was neither. This remarkable animal looked like wolf with tiger stripes on its back and tail, but it was more closely related to kangaroos than to either tigers or wolves. The Tasmanian tiger-wolf was a marsupial; it had a pouch for its young just like a kangaroo
The Tasmanian tiger-wolf became extinct on the mainland of Australia long ago because it could not compete for food with the dingo, a kind of wild dog. Tiger-wolves continued to thrive on the dingo-free island of Tasmania off Australia's south coast until Europeans arrived in the region. At that time, settlers began clearing the tiger-wolf's habitat for sheep farming. Habitat destruction reduced the natural prey available to tiger-wolves
With its natural prey base reduced, the tiger-wolf began to kill domestic sheep for food, much to the dismay of the local