What are the causesof animal extinction?

Risa Oba

Out Line

Introduction Deforestation Water pollution Alien species Conclusion Discussion

Introduction

5~15 million species 50,000 vertebrate

fish ,birds ,mammals etc. 50,000 species vanish a year

=more than 100 species a day

Introduction

Main causes of animal extinction

Deforest-

ation

Water pollutio

n

Alien animal

s

Deforestation

1 ½ acres lost every 1 sec

Deforestation

shortage of food→destroying ecosystem

plant insect birds mammals

Deforestation

Shortage of habitate.g. Java tiger (died out in 1972)

Water Pollution

Littering• Killing 100,000 animals & a million sea

birdsevery year!

Water Pollution

Oil Spill Ship accident, war etc. Exxon Valdez oil spill (1989)

kill 2,800 sea otters & 250,000 seabirds

Water Pollution

Polluted agricultural water 46.7% fish killing e.g. Iowa states

5.7 million fish dead

Water Pollution

Alien Species

Alien species: come from foreign country To kill harmful animals Accidentally

Caused hundred of extinction Mongoose in Hawaii Brown tree snake in Guam Mallard duck in Hawaii

Alien Species

Mongoose Puerto Rico->Hawaii To kill rats & snakes 12 reptiles & amphibian

-> extinction

Alien Species

Brown tree snake ? -> Guam Accidentally More than 10 birds

-> extinction

Alien Species

Mallard duck ? -> Hawaii To hunt Crossing with native ducks

Lose antibodyBecome sterile

※sterile: not able to produce babies.

Conclusion

1. Deforestation Destroying ecosystem & habitat

2. Water pollution Littering, oil spill & polluted water

3. Alien species Competition, predation & crossing

Conclusion

Endangered species23% mammals (1,130)

12% birds (1,194)

Discussion

What should we do to stop the animal extinction?

Thank you for listening!