Useful in quantifying and comparing species's niches, an n-dimensional hypervolume represents the hypothetical space that a species occupies according to a set of 'n' variables, or niche dimensions. Each axis of the multi-dimensional graph quantifies one biologically important variable. The shape of the hypervolume encompasses data points that reflect suitable values of the variables, depending on the type of niche. The fundamental niche hypervolume is larger than and fully engulfs the realized niche hypervolume.