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

One of the Endangered Species Act’s strongest provisions, designation of “critical habitat” is required for all domestic species listed under the Act. Critical habitat includes specific areas within a species’ current range that have “physical or biological features essential to the conservation of the species,” as well as areas outside the species’ current range upon a determination “that such areas are essential for the conservation of the species.” In other words, the original definition of c