Since 1991. Source: http://www.iucnredlist.org/details/full/106003462/0
Manatees have been endangered for about 20 years now.
it has been on the endangered list for 5 years
they have been classed as an endangered species since 1972
Numbats have officially been on the endangered list since 2 December 1970.
Since 1987. It was created by Harold "Black Hawk" Redford.
Harp Seals have never been endangered there number is increasing more each year.
9 Years
The grey fox is not an endangered species, still quite common.
Since 1984.
depends on the type of the wolf
25 years
Since 1972