3 Pages

Survival of Young Swifts in Relation to Brood-Size

ByChristopher Perrins

In a recent article in Nature, Wynne-Edwards said “the assumption, still rather widely made, [is] that under natural selection there can be no alternative to promoting the fecundity of the individual, providing this results in his leaving a larger contribution of progeny to posterity. This assumption is the chief obstacle to accepting the principle of intergroup selection.”