A very large or dense body or collection; a crowd, throng, multitude. (Often contemptuous.) of insects or other small creatures, esp. flying or…

Biology. A type or form of animal or plant common to different countries or regions.

any group of species whose members favour a similar habitat.

Ecology. A group of species which have similar roles in the same community.

a small colony of organisms, esp. of bacteria; a very small group of cells in culture.

a group of fossils occurring in the same location but not necessarily representing a former biocœnosis.

Within a species: a population which has distinctive ecological and morphological features; a member of such a population.

A group of animals or plants in the same place; (Ecology) a group of organisms growing or living together in natural conditions or occupying a…

A population forming part of a larger population; one derived or originating from some other population; a secondary or subordinate population.

A sub-population; a small or specialized population.