dhw: Another stunning example of how organisms work out different ways of feeding and protecting themselves. Regardless of our different interpretations of their behaviour, these posts are a constant source of delight, and I can only say once again how grateful I am to you for the ongoing education.

DAVID: Thank you. Note the stunning example of precise mutations appearing to produce exact scents. Not by chance!

dhw: Of course it’s not by chance. These little critters know exactly what they’re doing.

No, they are told what to do.