More than 8,000 scientists who are affiliated with the International Union for the Conservation of Nature (IUCN) have composed a list of 100 most endangered species worldwide. The list was presented at the World Conservation Congress in Jeju, South Korea. If strict actions are not taken, scientists fear these species could be extinct by 2020. Here are just a few species that are first in line to disappear if we sit back and do nothing to protect them. To get the full list visit IUCN.org.