A young bonobo and her mother Sean M. Lee/George Washington University
Bonobo infants become highly stressed when they get a younger sibling and they don’t recover for seven months, according to a study that monitored levels of a stress marker in their urine.
In humans, many firstborn children struggle with the arrival of a sibling because “they’ve lived in a world where they have pretty unlimited access to parental time and attention, and now they’re having to share itâ€, says at the University of Queensland in Brisbane, Australia.
To explore whether this transition is also…
