Copyright owner: Luomus
License: CC-BY-NC-SA-4.0
Caption: queen
Copyright owner: Luomus
License: CC-BY-NC-SA-4.0
Caption: male
Copyright owner: Luomus
License: CC-BY-NC-SA-4.0
Caption: worker
Copyright owner: Norsk institutt for naturforskning
License: CC-BY-3.0
Caption: male genital (https://www.artsdatabanken.no/Pages/156313/Polarhumle)