An ecosystem is a group of animals, plants and microorganisms that live together. The group of each type of living thing is called a community, and the place that they live is called a habitat.

Walia ibex are the national symbol of Ethiopia. Once widespread, they have been forced by human predation to occupy a marginal niche habitat on the sheer cliffs of Ethiopia’s mountains.

This lack of competition creates a new niche in the ecosystem, promoting increased ... initially attracting small prey animals. With ample habitat and few predators, small mammals like mice ...