I'm thinking it might be way the species evolved to avoid attracting predators? I doubt there's much maneuverability in the trees if they're being hunted by a predator, so they might try to lower their chances of getting noticed in the first place.
@Tortdad If you're still interested In silkworms, I have a ton and am trying to thin out my colony. I can ship some to you if you're in the US.
For bsfl, can someone tell me how often you are supposed to feed them to the lizards? I was told that they can be fed as a staple, but then people who...