The crocodile had lived by herself for 16 years before laying 14 eggs in her enclosure. Zookeepers were shocked to find that some of them were viable.
All Canada Photos / Alamy Stock PhotoAmerican crocodile basking in Belize , Central America .
In 2018 , zookeepers at a Costa Rican zoological garden found 14 bollock in the enclosure of a distaff American crocodile who had lived alone for the past 16 age .
And while distaff crocodile can lay sterile egg , the zookeepers were shocked to notice that at least seven bollock were prolific , ABC News reports . When they put the feasible eggs in an incubator , only one bear on to develop but eventually stop . The zookeepers later spread up the egg to find a well - formed , stillborn distaff crocodile .
All Canada Photos/Alamy Stock PhotoAmerican crocodile basking in Belize, Central America.
With news that a female crocodile pose a practicable egg without a mate , research worker began investigating .
researcher remark that parthenogenesis , or the ability of a female animal to asexually reproduce by mixing her own factor rather than require a male ’s sperm cell , is present in over 80 craniate species , including lizard , snake , and sharks . But before 2018 , researcher had never seen this ability in crocodile .
In a study published in the journalBiology Letters , research worker found that the stillborn crocodile was a parthenogen . The fetus and its mother shared much identical genotypes , pointing to a very specific procreative strategy .
Booth et al./Biology Letters, 2023A phylogenetic tree of Reptilia. The displayed lineages have records of parthenogenesis.
In a pure birth , a distaff fuze its bollock with gelid consistency — small cells containing chromosomes . Typically , pivotal bodies are byproduct of orchis divide during breeding and simply shrivel away . But in animals capable of parthenogenesis , the polar body fuse with the dividing egg , making the foundation for a practicable fetus .
The enquiry into parthenogeny in crocodile also revealed interesting hypotheses about the power of other , long - extinct creature to asexually multiply .
“ This new evidence offer tantalizing insights into the potential reproductive capableness of out archosaurian relatives of crocodilian reptile , notably the Pterosauria and Dinosauria , ” the study detailed .
throw the nonsexual reproductive memory ability of birds and crocodiles , it is likely that their unwashed ancestors — dinosaur and flying reptile — possessed the ability to reproduce asexually as well .
“ What this tells us is it ’s very probable that this also go on in pterosaurs and dinosaurs , ” Warren Booth , an associate prof of entomology at Virginia Tech who studied the bollock , told theNew York Times .
“ We ’ll never be able to prove they could do it , ” Dr. Booth said . “ But it suggests they had the power . ”
Booth et al./Biology Letters , 2023A phylogenetic Sir Herbert Beerbohm Tree of Reptilia . The display linage have records of parthenogenesis .
And although parthenogenesis can create viable fetuses , it lacks the genetic multifariousness of intimate reproduction and can often lead to less healthy offspring . Despite this , some animals capable of parthenogenesis use this method acting even when prolific Male are plentiful , like the California condor .
Interestingly , some females can lay a grasp of eggs made up of both normal materialisation and parthenogens .
Because of this , Dr. Booth suggests that virgin birth may have an evolutionary vantage . Their offspring could live on just long enough to fill spouse and produce more genetically - wide-ranging and salubrious offspring .
Whatever the grounds , Dr. Booth believes that it is an ability that can possibly be switch on and off , and may be operate by a single gene .
Booth and other study contributors save that parthenogenesis is “ in all likelihood possessed by a distant common ascendant of [ bird , snake , and lizard ] lineages . ” But of course , researchers must collect more data to “ fully test the evolutionary distribution and dynamic of [ parthenogenesis ] across deeper evolutionary meter . ”
After learning about the asexual replica of a crocodile , find the“virgin birth ” of the California condor . Then , plunge into the narration of10 animals that can be both virile and female .
