For a planet that is 4.543 billion years old, Earth has been holding up very well.

However, in the last few decades, scientists have noticed a rapid increase in degradation of ecosystems and global warming caused by "greenhouse gases and releasing vast amounts of agricultural chemicals into the environment."

Although there hasn't been a decline in the human population, some animal species have been dying out. About 1 in 6 animal and plant species will become extinct during our lifetime.

The International Union for Conservation of Nature released their comprehensive "Red List" which names the world's critically endangered species and it is quite alarming.

There are 5,210 animal species on the list and the organization believes that many of them have an "extremely high risk of going extinct any time soon."

Here's a list of 10 well-known species whose populations are dwindling at a high rate and are on the brink of extinction:

1. Javan Rhino - 60 remaining

2. Amur Leopard - 70 remaining

3. Malayan Tiger - 250-340 remaining

4. Slender-billed Curlew - Less than 50 remaining

5. Iberian Lynx - 404 remaining

6. Sumatran Elephant - 2,400 - 2,800 remaining

7. Mountain Gorilla - 790 remaining

8. Hawksbills Turtle - Approx. 8,000 females are remaining

9. Sumatran Orangutan - 14, 613 remaining

10. Yangtze Finless Porpoise - 1,000 -1,800 remaining

You can see the rest of the animals that made it onto the Red List of Threatened Species here.

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[h/t: Daily Mail]