Reproduction takes two, right? Well, not always. Many arthropods and microscopic animals called rotifers reproduce clonally and although it is relatively rare in vertebrates, clonal reproduction has been confirmed in several species of fish, amphibians, birds and reptiles. Known as parthenogenesis, clonal reproduction in vertebrates can occur when an offspring develops from an unfertilised egg. Parthenogenesis has never been observed to occur naturally in mammals, although it is possible to induce it artificially in the lab.
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