I hope that this book has opened readers’ eyes to the incredibly diverse ways in which parents in nature gestate their young. Pregnancy from an evolutionary perspective might seem to be strikingly different from the loving and cooperative venture that most people probably have in mind when they think about motherhood. However, cooperation and conflict (much like loyalty and enmity) are much like the opposite sides of a coin and thus may not be quite so disconnected as they at first appear. Regardless of how we might wish to view pregnancy and related gestational phenomena, the fact remains that Mother Nature and Father Time have collaborated to spawn a fabulous variety of evolved means by which one or the other parental sex in effect jump-starts its progeny in each successive generation. I hope that this evolutionary primer on pregnancy has conveyed this message in an entertaining and informative manner and that the result is a deeper reader appreciation for the many reproductive dramas entailed in embryonic gestation.