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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
Parthenogenesis and Copperheads. Though most of the organisms that use asexual reproduction are invertebrates, several species of vertebrate animals do make use of it. Some, like copperhead snakes, can reproduce asexually as an alternative to their typical sexual reproduction.