Overly aggressive + small is listed as the prime example of two traits that are disadvantageous together in the prologue or the first chapter (I forget which) of The Selfish Gene. This literally an instance of natural selection.

Some traits work well together. Overly aggressive + small does not, and is in fact listed as the prime example of two traits that are disadvantageous together in the prologue or the first chapter (I forget which) of The Selfish Gene. This literally an instance of natural selection.