There are hundreds of reasons, but some very common ones are, food shortage, global warming, habitat loss, and poaching. Is this what you were looking for?
they become endangered in 2099.
they started to become endangered when global warming had started to increase
they become endangered when the food they eat is scarce.
They are listed as vulnurable or threatened, not endangered.
Peacocks and peahens are not endangered.
There are many things that can cause an ecosystem to become endangered. When an ecosystem and the species in that ecosystem become endangered, it is known as a hotspot.
Yes. There are five endangered species now. Twelve are not endangered.
The Nile crocodile is not endangered.
Not entirely. But they might become endangered soon.
It was endangered in 1997.
cougars are not endangered,save for the Florida race.
it has just become endangered http://www.environment.nsw.gov.au/determinations/BlueWhaleEndSpListing.htm