08/04/2026
A 10-year-old student from Japan is drawing international attention after his observations of pet butterflies led to a scientific finding about insect memory. Jo Nagai noticed that the swallowtail butterflies he had raised continued to respond to experiences from their caterpillar stage after metamorphosis, inspiring him to investigate whether those memories could survive the dramatic transformation into adulthood. His project earned recognition at science competitions and has sparked widespread interest online.
Nagai’s research suggests that butterflies may retain certain learned behaviors from their time as caterpillars, adding to a growing body of evidence that insect memory can persist through metamorphosis. While scientists continue to study the mechanisms behind this phenomenon, the young researcher’s curiosity and careful experimentation have been praised as an example of how simple observations can lead to meaningful scientific discoveries.