The barrier to parthenogenesis in mammals, it seems, is something known as genetic imprinting.

ECONOMIST: A ��virgin birth�� in mice

Past attempts to create live mice by parthenogenesis, for example by stimulating mature eggs with chemicals, have failed.

ECONOMIST: A ��virgin birth�� in mice

Other techniques may include preserving genetic material, cloning, or gynogenesis, where fish eggs are coerced into developing via parthenogenesis.

BBC: Earth News - Giant fish 'verges on extinction'

Rotifers are unusual in that they often reproduce by parthenogenesis (some species, indeed, can reproduce only in this way).

ECONOMIST: Extending lifespan

Although extremely rare in vertebrates, parthenogenesis (out of the Greek for "virgin birth") occurs in a number of lower animals.

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