A crocodile in Costa Rica has made herself pregnant, the primary recorded occasion of a "virgin birth" within the reptile species. 

The crocodile was stored in captivity in a zoo and had no contact with males - however a fully-formed foetus was found inside one in every of her eggs.

The foetus was 99.9% genetically an identical to the mom, confirming it had no father.

Virgin births, or parthenogenesis, have been documented in birds, lizards, snakes and fish, however by no means earlier than in crocodiles.

The crocodile in query was 18 when she laid a clutch of eggs in 2018.

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Seven of the eggs gave the impression to be viable and have been incubated however when none hatched after three months they have been opened. One contained a stillborn crocodile foetus.

Researchers from Virginia Tech who specialize in parthenogenesis analysed the foetus and their findings have been printed within the Royal Society journal Biology Letters.

They mentioned the invention suggests virgin births may very well be occurring in crocodiles with out anybody realising.

"It is not uncommon for captive reptiles to lay clutches of eggs, given the period of isolation from mates, these would normally be considered non-viable and discarded.

"These findings due to this fact counsel that eggs needs to be assessed for potential viability when males are absent.

"Furthermore, given that (virgin births) can occur in the presence of potential mates, instances of this may be missed when reproduction occurs in females co-habited with males."

The scientists mentioned the invention gives "tantalising insights" into the potential reproductive capabilities of extinct relations of crocodiles, significantly dinosaurs.