Environmental activists from around the world say that more than 800 species of animals are on the verge of extinction which can be saved by spending around $1,000 a year.

“This is a whole suite of species threatened with extinction," said Stuart Butchart, global species program coordinator with BirdLife International.

As the group has not studies every organism in this planet, the list only contains mammals, reptiles, birds, amphibians and conifers. The recent entrants to this long list are European and African freshwater fish, Asian unicorn, hippopotamus, scaly anteater, polar bear and some species of sharks.

The International Union for Conservation of Nature and Natural Resources (IUCN) list includes around 16,000 potentially endangered species. It is shocking to know that the list contains 1 in 4 mammals, 1 in 3 amphibians and one fourth of coniferous trees.

According to IUCN, most of the species are threatened by human activities like over exploitation of the land and pollution. Climate change and habitat loss endangers 80 percent of the species world over. In addition, men hunt these animals for food and commercial purposes. Some of the animals are used in traditional medicines.

The study is conducted by 13 environmental groups including the American Bird Conservancy, Zoological Society of London and Conservation International. They have created 595 sites which contains the complete information on the 800 endangered species.

According to the scientist biodiversity is at potential danger. The threat to nature and species is on the rise. Once we let these animals die, their whole unique features and characteristics will be lost forever.