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Animal Reproductive Strategies The ultimate goal of each species is to produce the maximum number of surviving offspring using the least amount of energy. This is called the reproductive effort. Asexual reproduction is energy efficient (low reproductive effort) as it involves only one animal. Sexual
Butterflies reproduce the way other animals do -- sperm from a male fertilizes eggs from a female. Males and females of the same species recognize one another by the size, color, shape and vein structure of the wings, all of which are species specific. Butterflies also recognize each other through pheromones, or scents. During mating, males use clasping organs on their abdomens to grasp females.