Resource allocation trade-offs shape the development of all animals, but most of the time the effects are trivial. When animals begin to invest unusually heavily into particular structures, however, the effects of trade-offs become more pronounced. Weapons caught up in arms races get very big very fast, and in these species resources channeled into growth of the weapons can drastically impair bodily functions. In insects, this sometimes means reduced growth of other body parts.

Emlen, Douglas J, Animal Weapons_ The Evoluti…, loc. 296