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Female Crocodile Self-fertilizes And Becomes Pregnant


A groundbreaking discovery has been made at a zoo in Costa Rica, where scientists have identified the first documented case where a female crocodile self-fertilizes and becomes pregnant, which is called virgin birth or asexual reproduction.

This phenomenon involves an organism producing offspring without the need for fertilization by a male individual. While virgin birth has been observed in certain species of birds, fish, and other reptiles, it had never been documented in crocodiles until now.

In this particular instance, the crocodile in question was able to produce a fetus that shared an astonishing 99.9% genetic similarity with itself. This finding provides fascinating insights into the potential reproductive capabilities of crocodiles and raises intriguing questions about the evolutionary history of this ancient reptilian lineage.

According to the scientists involved in the research, it is possible that this ability for asexual reproduction may have been inherited from an evolutionary ancestor. This suggests that even dinosaurs, which are believed to be distant relatives of modern crocodiles, might have possessed the capacity for self-reproduction. If this hypothesis proves accurate, it would revolutionize our understanding of dinosaur reproduction and provide new avenues for studying the ancient past.

The research documenting this exceptional crocodile case has been published in the prestigious Royal Society journal, Biology Letters. This publication ensures that the scientific community and the wider public can access and scrutinize the findings, contributing to the advancement of knowledge in this field.

COPYRIGHT_WI: Published on https://washingtonindependent.com/female-crocodile-self-fertilizes-and-becomes-pregnant/ by Tyrese Griffin on 2023-06-08T14:12:57.900Z

In January 2018, a remarkable event took place at Parque Reptilania, where an 18-year-old female American crocodile laid an egg. However, the egg did not hatch, and upon examination, it was discovered that the fetus inside was fully formed but stillborn. What made this occurrence truly extraordinary was that the crocodile had reproduced through a process called parthenogenesis, commonly known as "virgin birth."

Crocodile makes herself pregnant in Costa Rica zoo - BBC News

Throughout her entire life, the crocodile had been kept separate from other individuals of her species. This isolation prompted the scientific team at the park to seek the expertise of Dr. Warren Booth, originally from Belfast and currently affiliated with Virginia Tech in the United States. Dr. Booth has dedicated 11 years of his career to studying parthenogenesis, and his knowledge was instrumental in unraveling the mysteries of this unique case.

Upon analyzing the fetus, Dr. Booth made a fascinating discovery - the genetic analysis revealed that the fetus was over 99.9% genetically identical to its mother. This finding conclusively confirmed that the fetus had been produced without the contribution of a male counterpart, reaffirming the occurrence of parthenogenesis in this American crocodile.

According to a statement by Dr. Booth:

We see it in in sharks, birds, snakes and lizards and it is remarkably common and widespread.- Dr. Warren Booth, affiliated with Virginia Tech in the United States

It has been suggested that the absence of documented cases of parthenogenesis in crocodiles may be attributed to a lack of focused investigation on the subject matter.

''There was a big increase in reports of parthenogenesis when people started keeping pet snakes. But your average reptile keeper doesn't keep a crocodile," he said.

According to one theory, parthenogenesis may occur in species capable of this reproductive method when their populations face a decline, such as when they are on the brink of extinction. Dr. Booth, in an interview with BBC News, proposed that this phenomenon might have occurred in certain dinosaur species as their numbers dwindled due to environmental changes.


The remarkable similarity in the mechanism of parthenogenesis across diverse species implies that it is an ancient trait that has been inherited throughout evolutionary history. This observation lends support to the notion that dinosaurs could have potentially reproduced through parthenogenesis as well.

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About The Authors

Tyrese Griffin

Tyrese Griffin - Tyrese started her education in the performing arts at the prestigious Alexander Hamilton Academy in Los Angeles. She returned to civilian life after serving in the United States Army as a tracked vehicle operator, and started writing short stories and screenplays, as well as directing short films and music videos. She has published six novels, which have sold over 200,000 copies, as well as audiobooks and short stories for anthologies, and has earned several awards.

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