Mice Display Unexpected Midwifery Skills, Challenging Understanding of Animal Care
A groundbreaking new study reveals that mice exhibit surprising levels of social support during childbirth, actively assisting struggling mothers and dramatically improving survival rates for both mothers and pups. This behavior, observed for the first time in a non-primate species, is prompting scientists to reconsider the extent of empathy and social cooperation in the animal kingdom.
The study, published in [Insert Publication Here – e.g., a scientific journal or conference proceedings], focuses on the complex challenges of human infants and the complexities of the human birth canal.While other primates, like black snub-nosed monkeys and bonobos, occasionally offer assistance, mice were not previously thought capable of such complex social behavior.
The revelation emerged unexpectedly during research conducted by Robert Froemke of NYU Langone Health in New York and his team. While initially recording brain activity in mice during labour,researchers noticed that other mice in the cage were interacting with the birthing mothers in ways that appeared to be helpful.
To investigate further, the team genetically engineered pregnant mice to lack oxytocin receptors. Oxytocin,frequently enough referred to as the “love hormone,” plays a crucial role in inducing the uterine contractions necessary for delivery. Without these contractions, pups can become stuck, leading to maternal and pup mortality.
Researchers then paired ten of these pregnant mice, lacking oxytocin receptors, with experienced mothers – females who had previously given birth. A control group of seven pregnant mice lacking oxytocin receptors were housed alone. The results were striking.
“She will come and act like a little mouse midwife and very carefully, with her mouth and her paws, she will remove the puppy,” explained a researcher involved in the study, who presented the findings at a meeting of the Society for Neuroscience in San Diego, California. the helper mice didn’t stop ther; they also broke open the amniotic sac surrounding the newborns, enabling them to breathe.
Remarkably, nine out of ten pregnant mice paired with “midwife” mice survived labor, with approximately 90% of their litters also surviving. In stark contrast, only one of the lone pregnant mice survived, and all of her pups perished.”There are many reasons why mammals are social, and one of the main reasons is to help each other, especially in times of great vulnerability,” the researcher stated. “Even mice have trouble giving birth and caring for children, like us, and can help others so it’s not so traumatic, maybe a bit like us.”
Further experiments explored the necessity of maternal experience. Fourteen additional pregnant mice lacking oxytocin receptors were housed with either male mice, females who had never given birth, or females lacking oxytocin receptors. Survival rates improved when other mice were present, but the nature of the assistance varied.
While males tended to apply pressure to the pregnant female’s back, possibly aiding expulsion, non-mother females engaged in grooming and abdominal pressure. Nearly 60% of mice housed with males survived labor, as did half of those housed with non-mother females. Though, none of the pups in these groups survived, as their fluid-filled sacs remained intact.Of the three mice paired with females also lacking oxytocin receptors, only one survived.
“It truly seems that mothering experience is necessary to be successful as a (mouse) midwife,” the researcher concluded. These findings align with previous observations of grooming as a common behavior in the animal kingdom, including instances of mice providing first aid to unconscious companions.
Bianca Jones Marlin of Columbia University in New York emphasized that the research suggests birth and rearing are “central organizing forces in animals’ relationships and social networks.” She added that “parental care is one of the moast influential social interactions” and that these results underline that it “requires support.”
The researchers suspect that this midwife-like behavior occurs in wild mice and potentially other rodents. “Giving birth is the most vulnerable time in an animal’s life,” the researcher noted,suggesting that the rarity of observations in the wild may be due to animals seeking concealment from predators during this sensitive period. This discovery challenges long-held assumptions about the limits of animal compassion and highlights the profound importance of social support, even in the smallest of creatures.
