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[[File:Dasyurus maculatus skeleton.jpg|thumb|right|''Skeleton of a tiger quoll (Dasyurus maculatus)'']]
'''Allometry''' is the study of the relationship of body size to shape, anatomy, [[physiology ]] and finally behaviour, first outlined by Otto Snell in 1892, by D'Arcy Thompson in 1917 in On Growth and Form and by Julian Huxley in 1932. Allometry is a well-known study, particularly in statistical shape analysis for its theoretical developments, as well as in biology for practical applications to the differential growth rates of the parts of a living organism's body. One application is in the study of various insect species (e.g., the Hercules Beetle), where a small change in overall body size can lead to an enormous and disproportionate increase in the dimensions of appendages such as legs, antennae, or horns. The relationship between the two measured quantities is often expressed as a power law equation:
y = k x a {\displaystyle y=kx^{a}\,\!} {\displaystyle y=kx^{a}\,\!}
