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There are so many reasons that animals go extinct, in more recent years it is generally due to human intervention. From building homes to devastating rainforests and other ecosystems with climate change, our animal kingdom shrinks by the year. Disease, epidemic, and even acid rain can inhibit animals from surviving, even cosmic radiation can come into play. Despite all of these factors the largest interference in the animal kingdom comes from climate heating and cooling as well as changes in currents or sea levels. Some extinction is a form of speciation, where an animal adjusts to ecological settings and evolves, leaving the former species to go extinct.

Lots of animals became extinct before humans even existed, like dinosaurs or giant sea predatory monsters. When the ice age came many of these enormous species died off, which is probably one reason that humans were able to survive enough to evolve where we’ve gotten to today. Biologists and ecologists study the past, present, and future trends that might affect the animal kingdom since human beings are, in fact, a part of it. More than 99% of all the 5 billion species that have ever existed are now extinct. These are some of the biggest, scariest, predatory ones that we could find.