6 things to know about Earth's 6th mass extinction | INTELLIGENT WORLD TODAY | Scoop.it
A 2016 study also suggests this sixth mass extinction is killing off large ocean dwellers (like sharks, whales, giant clams, sea turtles and tuna) in disproportionately greater numbers than smaller animals. That's a reversal from past extinctions, when there was a slight connection between smaller size and going extinct.

And while previous extinctions were often linked to asteroids or volcanoes, this one is an inside job. It's caused mainly by one species — a mammal, ironically. The current crisis is the handiwork of humans, and we have a "unique propensity to cull the largest members of a population," the authors of the 2016 study write.