Two examples of species that became endangered because their ecosystem had become disturbed.

..BLACK-FOOTED FERRET..

Black-footed Ferret (Mustela nigripes) is a small carnivorous North American prairie animal. It is a mammal and carnivore species. It average life span in captivity is 12 years. These solitary animals live alone, and in May and June females give birth to litters of one to six kits that they raise alone. The young are able to survive on their own by fall.

Though, it will also eat other small mammals, birds, and insects, a single Black-footed ferret eat about 100 prairie dogs a year. The loss of their prairie grassland habitat, the drastic reduction of prairie dog numbers (through both habitat loss and poisoning), makes the population of the black-footed ferret become decrease.

The Black-footed Ferret is listed as "Endangered" under the Endangered Species Act since September 20, 2005. According to the U. S. Fish and Wildlife Service (USFWS). This animal becomes an endangered mammal in North America. It became extirpated in the wild in Canada in 1937, and were classified as endangered in the U.S. in 1967. The last known wild population was taken into captivity in 1985, a few years after its accidental discovery in Meeteetse, Wyoming. Release of captive animals has successfully re-introduced the species to parts of its former habitat, and currently these populations have made what has been called an "astonishing comeback". (Wikipedia)

You may click here to find this article source
To view more about this topic, you can visit http://www.blackfootedferret.org/

..TIGER..

Tiger become one of the species that is endangered because it ecosystem was disturbed. Tigers are the largest of all the Asian big cats. They are also one of the most culturally important and beautiful animals in this planet. Basically, tiger are found in Bangladesh, Bhutan, Cambodia, China, India, Indonesia (Sumatra), Laos, Malaysia, Myanmar, Nepal, North Korea, Russia (Far East), Thailand and Vietnam. There are three subspecies of tiger that already extinct which are Bali, Caspian and Javan. Nowadays, tigers also survive in only 40% less area than they occupied a decade ago...(WWF)

If you are interested to learn more, please visit http://en.wikipedia.org/wiki/Tiger
Source taken from click here.