Answer:
Keystone species
Explanation:
A keystone species is the one that affects the structure and function of the community irrespective of its small population size. The keystone species is not the most abundant species of the community but occupies an ecological niche that regulates and maintains the structure and function of the rest of the community.
Elephants serve in the dispersal of seeds, make new habitats for various plant species by crushing the woody plants with their feet. Since elephants are shown to regulate the species richness by making space for new species and seed dispersal, they are the keystone species.