Costa Rica: Virgin Birth of a Crocodile

The reptile had been in captivity for 16 years when zookeepers discovered the eggs.

Editorial team Wild beim Wild · 8 June 2023

First known virgin birth in a crocodile documented in Costa Rica

First virgin birth in a crocodile

Scientists in Costa Rica have identified the first known case of a “virgin birth” in a female crocodile that had had no contact with males for 16 years.

The reptile was able to produce a fully formed foetus that was 99.9% genetically identical to it.

According to the researchers, this discovery, published in the journal Biology Letters, offers “tantalising insights” suggesting that their evolutionary ancestors, such as the dinosaurs, may also have been capable of self-reproduction.

Virgin birth, also known as facultative parthenogenesis, has already been documented in birds, fish, lizards and snakes, but never before in crocodiles. It is a process in which an egg cell develops into an embryo without fertilisation by sperm.

The American crocodile (Crocodylus acutus) was taken into captivity in 2002 at the age of two and brought to an enclosure in Costa Rica. There, it remained alone for the next 16 years.

The Zookeepers discovered a clutch of 14 eggs in the enclosure. These eggs did not hatch, but one contained a fully developed foetus.

A genetic analysis of the foetus's heart and the mother's skin tissue showed a 99.9% match, confirming that the offspring had no father.

Facultative parthenogenesis is rare, but is thought to occur when a species is confronted with difficult or unfavourable conditions, such as environmental stress or a lack of mates.

Costa Rica

Costa Rica really is a paradise on earth, known for its rich Wildlife. Numerous species are native here, including many different types of reptiles. One such reptile, particularly popular with tourists, is the crocodile. Locally, it is known as the «Cocodrilo» and is an impressive animal that should not be missed.

The American crocodile is one of the best-known species in Costa Rica and can be found in many different regions of the country. These impressive Animals can reach a length of up to six metres and are famous for their expressive eyes and impressive jaw strength. More on the topic of species protection and Studies.

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