They look sick indeed 
Some kind of viral/bacterial infection?
Mostly once they are sick, you can't help them anymore.
Which species is it?
Saturnia Pyri. I have removed the unhealty looking caterpillars to another location so the healty once aren't getting infected
I don't understand how they got sick I have removed the old leaves and feces everyday.
Is the hostplant a safe one? ( did u use it before on catties without losses?)
When it's a new plant it also can be treated with insecticides or fertilizers.
You also should put the healthy ones in a fresh clean box on fresh food to prevent spreading in case of infection,
and make sure they get ventilated very well. 
I hope the still ok ones are gonna stay healthy and grow big!
Yes all the plants are from my garden so they should be safe normally. My Brahmaea and Bombyx don't seem to be sick but some Samia Ricini caterpillars got the same symptoms.
I've put the healthy ones in a fresh box with fresh leaves so let's hope they'll be ok 
Let's hope the healthy ones stay healthy 
Hello,
the video quality is not the best, but I do not think they are sick; they look a little bit like caterpillars in a molting phase. If I'm right they turn around because they can't find any hold!
Please check the head and if I'm right put them on a piece of paper towel. Some caterpillars are able to grab this material in this phase.
Do you pull them off when you change the food?
Please reply, because if I'm right it's not too late.
PS: Do you just put the leafes on the ground?
Oh dear, lets hope it does not get worse and spread even more.
So it's dry skin season for you - you should wash you hands very regularely, also when going from one cage/box to another.
Hope you will have some luck!
Hello,
the video quality is not the best, but I do not think they are sick; they look a little bit like caterpillars in a molting phase. If I'm right they turn around because they can't find any hold!
Please check the head and if I'm right put them on a piece of paper towel. Some caterpillars are able to grab this material in this phase.
Did you pull them off when you change the food?
Please reply, because if I'm right it's not too late.
I thought about that too, just dismissed it because they are all different sizes and look dry.
That would be the best case though!
It looks like one L1 and five L2s.
Wietse, you can use every material with a rough, but fine surface. A fuzzy piece of cotton cloth is also possible.
We need to take a closer look at the head. Maybe you can post a photo?
Please be so kind to post a photo (sideview) to make sure they really are in the molting phase.
Please be so kind to post a photo to make sure they really are in the molting phase.
I'll make one now
>I've tried but I still think it's an infection. Most of the caterpillars have already died.
Okay, that's sad.
It`s a really sad day today I`m going to make sure that the others don`t get infected
That is very sad, also hoped for better news.
Good luck with the remaining catties, hope some of them will make it trough all this!
Okay, this really has nothing to do with a molting.
Maybe some will make it. Wish you good luck!
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