Males of many species are characterized by alternative mating tactics. In bluegill sunfish (Lepomis macrochirus), some males delay maturation and become "parentals" while other males mature precociously and become "cuckolders." Parentals use an overt, territorial mating tactic, defending a nest...

Animals engaged in a complex task are often unable to allocate enough attention to a second concurrent task. We tested the hypothesis that cerebral lateralization is advantageous because it enables separate and parallel information processing and allows for a more efficient performance of...