Several animal species are on the brink of extinction

Several animal species are on the brink of extinction due to a combination of habitat loss, poaching, climate change, and other human activities. Some of the most critically endangered species include:

1. **Orangutans**: Both Bornean and Sumatran orangutans have seen their populations decline dramatically due to deforestation and habitat loss for palm oil plantations. There are now estimated to be around 104,700 Bornean and 13,846 Sumatran orangutans left【73†source】.

2. **Gorillas**: With three out of four subspecies listed as critically endangered, gorillas face threats from poaching, disease, and habitat destruction. The Cross River Gorilla, in particular, has fewer than 300 individuals remaining【73†source】.

3. **Vaquita**: Known as the most endangered marine mammal, the vaquita has fewer than 10 individuals left. The primary threat is accidental entanglement in illegal fishing nets for totoaba fish【73†source】.

4. **Saola**: Often referred to as the Asian unicorn, the saola is extremely rare with fewer than 750 individuals, likely much less, due to habitat loss and hunting【73†source】.

5. **Yangtze Finless Porpoise**: With between 1,000 and 1,800 individuals left, this species is threatened by fishing, pollution, and boat traffic in the Yangtze River【73†source】.

6. **Tigers**: Fewer than 3,900 tigers remain in the wild, with the Sunda tiger being particularly vulnerable due to poaching and deforestation【73†source】.

Efforts to save these species involve habitat preservation, anti-poaching laws, and breeding programs, but the situation remains dire for many of these animals. For more information, you can refer to sources such as Earth.Org and Discover Magazine【72†source】【73†source】.