Extinction is the disappearance of the organism on the planet and the impossibility of reappearing, after this species stopped the ability to reproduce to ensure its existence.

One of the reasons for the extinction of animals is human intervention. Hunting is one of the most important factors leading to the extinction of animals. On the other hand, Most extinct species became extinct as a result of natural causes. In some cases predators became are more powerful and plentiful than the animals on which they prey; in other cases, a severe climate change made previously hospitable territory uninhabitable.

But other animals, such as the passenger pigeon, become extinct due to man-made loss of habitat and over-hunting. Human-caused environmental issues are also creating severe challenges to a number of now-endangered or threatened species.

Endangered Species International estimates that 99.9 percent of the animals that ever existed on earth have become extinct due to catastrophic events that occurred while the Earth was evolving. When these events cause animals to die, it’s called a mass extinction.

Some scientists believe that a mass extinction is taking place right now. Biologists have been raising the alarm: they believe Earth is undergoing a sixth mass extinction of both flora and fauna. There have been no mass extinctions in the past half-billion years, but now that human activities are impacting the Earth, extinctions are happening at an alarming rate. Extinction is something that occurs in nature, but not in the large numbers we are seeing today.

A normal rate of extinction, due to natural causes, is 1 to 5 species annually. With human activities such as the burning of fossil fuels and destruction of habitats, however, we are losing plant, animal and insect species at an alarmingly rapid rate. Scientists at the Center For Biological Diversity estimate that the rate is a thousand more, or even ten thousand more, than the 1 to 5. They believe dozens of animals are going extinct every single day.

The largest species by far rapidly heading toward extinction are amphibians. When frogs and other amphibians start to die off in large numbers, other species fall like dominoes. Save the Frogs, an organization dedicated to understanding the threat to frogs and other amphibians, estimates a third of the species are already on the threshold of going extinct. They are aggressively attempting to get the attention of the public and bring lawyers, politicians, teachers and especially the media to educate the public on the disastrous effect the mass extinction of a third of a species of amphibians will have on the health and well-being of our planet.