plants or animals that adversely affect the habitats and bioregions they invade economically, environmentally, and/or ecologically. They disrupt by dominating a region, Wilderness areas, particular habitats, and/or Wildland-urban interface land from loss of natural controls (i.e.: predators or herbivores).

Definition of invasive species on wikipedia

An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters. Also it could mean that due to deforestation there may be a lack of food and/or water.

Definition of Endangered species on wikipedia

To help these animals from going extinct you can go to Hinterland .com and visit all the ways you can make a difference.