The extinct species in the recent times and the causes of the extinction
The extinct species
The numbers of the living organisms is 10 million species now . There are about 138 species which becomes extinct everyday , So , If the rate of the extinction is constant . a great number of the species would become extinct .
There are hundred millions of the organisms extincted in the old times such as the dinosaur , and the mammoth , There are some extinct species in the recent times such as the golden frog , the dodo bird , the quagga , the Australian wild cat ( Tasmanian cat ) , And the passenger pigeon .
The Australian wild cat ( Tasmanian cat ) is a mammal which has a wolf’s head , a dog tail , a pouch like kangaroo , and striped skin like a tiger . The last member of its species died in Sidney Zoo , Australia in 1936 . Its extinction is due to the hunting by the peasants because it preys on the sheep and the chicken .
The dodo bird was one of the birds that live in the Indian islands which became extinct in 1681 in the Indian islands 50 years after man invaded these islands Because it was an easy target for hunters due to the reduced size of its wings , So , it was a non -flying bird , and it had short legs , So , it could not run fast .
The native habitat of the passenger pigeon was North America , There were more than billion ( 1000 million ) birds in 1850 , and the last member of its species died in one of the zoos in 1914 .
The extinction of the passenger pigeon is due to cutting the oak , and the beech trees , where they were used to build its nests , and it is due to the mass hunting of the birds , and the weak rates of the reproduction , where its female lays only one egg each spring .
The Quagga is mammal which is considered the midway between the horse and the zebra . The last member of its species was killed in South Africa 1883 . Its extinction was due to the continuous hunting , The golden frog had disappeared since 1989 , and had not been seen since that time .