The study and measurement of the relative growth of a part of an organism in comparison with the whole.

One example of allometry ("other" - "measurement") is the positive allometry shown by antlers (including those of the extinct Irish elk) and by horn-like structures generally. The larger the animal the disproportionately larger their antlers. Thus, if two deer are different sizes, one twice the size of the other, the larger one's antlers are more than twice as big.

This allometric relationship holds both intraspecifically (between members of the same species) and interspecifically.

The size of horn like structures is often said, wholly incorrectly in Sporus's view, to be due to sexual selection.

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