Rare Asexual Reproduction in Brazilian Rainbow Boa

A snake at a college in England has once again captivated staff and students by giving birth without ever having been in contact with a male snake. The 13-year-old Brazilian rainbow boa, named Ronaldo, previously made headlines in 2024 after unexpectedly producing 14 offspring asexually.

Second Litter – A First for the Species?

This time, Ronaldo gave birth to 12 more babies, marking her second instance of parthenogenesis – a rare form of asexual reproduction where embryos develop without fertilization. Pete Quinlan, an animal care technician at the college, stated, “I’ve done as much research as I can, and I can’t find any record of it happening twice.”

Signs Preceded the Birth

Quinlan noticed changes in Ronaldo’s behavior in the weeks leading up to the birth. He observed changes in her nesting behaviors, skin shedding, a loss of appetite, and stretching across her scales. “I had my suspicions for a couple of weeks and then suddenly she was showing all the signs,” he explained.

Understanding Parthenogenesis

Parthenogenesis is uncommon in vertebrates and particularly rare in species like the Brazilian rainbow boa. The college release noted that this phenomenon has only been documented three times in captive Brazilian Rainbow Boas worldwide. “But for it to happen twice with the same snake, is unheard of.”

Ronaldo’s Future and Ideal Conditions

Ronaldo is currently resting and recovering with her new brood. She will turn 14 years old this summer. Quinlan, who previously cared for Ronaldo for nine years, anticipates her eventual return to him. He believes the successful parthenogenesis is a testament to the excellent facilities at the college, stating, “She’s clearly had a great time at COPC – for parthenogenesis to happen, the conditions have to be perfect.”