A new study has revealed that growing up with lots of siblings – and fighting over food – makes zebra finches more sociable in later life. In contrast, finches with fewer siblings become pickier about who they hang out with, and are less outgoing.
A new study has revealed that growing up with lots of siblings – and fighting over food – makes zebra finches more sociable in later life. In contrast, finches with fewer siblings become pickier about who they hang out with, and are less outgoing.