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鈥檛 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 鈥渢hey鈥檝e lived in a world where they have pretty unlimited access to parental time and attention, and now they鈥檙e having to share it鈥, says at the University of Queensland in Brisbane, Australia.
To explore whether this transition is also…
