By Matt Walker
A female boa constrictor snake has given birth to two litters of extraordinary offspring.
Evidence suggests the mother snake has had multiple virgin births, producing 22 baby snakes that have no father.
More than that, the genetic make-up of the baby snakes is unlike any previously recorded among vertebrates, the group which includes almost all animals with a backbone.
Details are published in the Royal Society journal Biology Letters.
Virgin births do occur among animals.
Many invertebrates, such as insects, can produce offspring asexually, without ever having mated. They usually do this by cloning themselves, producing genetically identical offspring.
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