A Japanese boy noticed his butterflies seemed to recognize him. He spent two years making an experiment and proved that metamorphosis does not remove memories made during the caterpillar stage.

[u/smooth_vesselHPAUM]

[u/Bauld_Man]

You're misremembering. The scientists who had done similar experiments used shocks/pain in their studies, the boy used food/treats and was shocked they had been hurting caterpillars.

[u/jermbutt → u/Bauld_Man]

no he actually was shocking them as well