It's safe to say that most of us are familiar with the concept of mass extinction. But this is by no means a recent phenomenon. For millions of years, Earth has been through extinction events that have shaped the planet. Yes, you know that dinosaurs were made extinct in one of these events. But many scientists argue that we're going through a mass extinction even in this day and age.
Intrigued? Browse through the following gallery to learn more about mass extinction events on Earth.