17 Most Endangered Animals - Every year, more species edge closer to extinction. From the mighty northern white rhino—with just two left alive—to the elusive vaquita porpoise, which has fewer than 10 individuals remaining, these animals represent the fragile edge of survival. In this video, we bring you a striking 3D tower comparison of the 17 most endangered animals in the world, based on the IUCN Red List and highlighted in a recent feature by Laura Dorr. | The Brain Maze