09/09/2021
I haven't been posting as much as I'd like because I haven't had much time to take photos and write about them, so for this post I'll be discussing silkworm behaviours and what they mean, at least as far as my experience allows me to understand.
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Stretching upward and flailing:
They have detected a disturbance or the scent of jasmine in mulberry leaves and are simply looking for food.
Staying still for long periods:
If they have their head tucked in, look puffy and respond to touch, they are most likely in shed. They may even be found on their side or on their back, but as long as they respond to touch, they are probably fine.
Shaking their head side to side:
Something has irritated them. This could be as harmless as a breeze or something touching them. However, it could also indicate that another worm has bitten their caudal horn (tail) which could become infected. Clear fluid coating the worms body or back end are indicators of this. This may happen during feeding frenzies if there isn't enough leaf surface area for worms to eat from. It could also be because the box they are in or old leaf mound they are on is too small for the amount of worms there are.
Becoming wrinkly:
In extreme cases, this could be due to starvation but they are most likely starting to become a pupae without having created a silk cocoon. I'm not exactly sure why this happens, I tend to put it down to genetics or sheer laziness. A healthy moth can emerge from such a pupae, as long as it is kept in a safe place. Don't worry about rotation while they are in this phase, being moved will not effect them and they will sometimes move by themselves.
Wiggling slowly, curling and not responding to food:
The worm is very uncomfortable or in pain. This could be because of an injury, infection or disease. There is little you can do other than isolate it from the other worms in case it's affliction is contagious. Still offer it small amounts of mulberry leaf daily because it may want to eat and there is a chance it will get better.
Turning black:
This is an early sign of death. Once again, the only thing you can do is isolate the worm and make it as comfortable as possible.
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I am not a scientist and do not study silkworms professionally, these are just things I've observed and come to my own conclusions about.
Let me know if I'm inaccurate about any of this or if you've seen other behaviours that I didn't mention here. Feel free to message me or send photos of your worms if you've noticed anything out of the ordinary and need advice.
Happy silkworm keeping. 🐛