When calculating the extinction rate, we face different kinds of problems. We don’t know what’s out there.  It is predicted that there are ∼8.7 million (±1.3 million SE) species globally, of which ∼2.2 million (±0.18 million SE) are marine. The results suggest that some 86% of the species on Earth, and 91% in the ocean, still await description. (2)
Although, we can still calculate an extinction rate. The number of wild animals on Earth has halved in the past 40 years, according to a new analysis.
We have lost one half of the animal population and knowing this is driven by human consumption, this is clearly a call to arms, and we must act now,” said Mike Barratt, director of science and policy at WWF. (3)
Saving animals, saving the future
3 examples for already extinct animals
Western Black Rhino (officially extinct 2011)
Pyrenean Ibex ( population dropped to 100 in the 1990s, officially extinct 2000)
The Golden Toad (extinction 1989)
Please, go back and watch the video. Everybody needs to get involved.