In January 2018, a female crocodile who lived alone for 16 years at a zoo in Costa Rica laid her eggs.. One of them turned out to be “working” - a cub was fully formed in it. Although he was stillborn after maturing in an incubator, this is the first known case of parthenogenesis in crocodilians, according to a study published June 7 in the scientific journal Biology Letters..

The precedent suggests that female dinosaurs and pterosaurs could also breed without males, notes Warren Booth, an associate professor at Virginia Tech who has studied crocodile eggs..

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At the moment, cases of parthenogenesis have also been recorded in some species of lizards, snakes, fish and insects..

It is assumed that this phenomenon occurs to help the species survive, however, there are cases when even those females who had previous contact with males produce offspring without fertilization by sperm.. In 2020, scientists discovered that lizards can mate and then lay eggs in which some are normal offspring and others are parthenogens..

In 2021, scientists discovered that without the participation of males, female condors are also able to breed..