They get their food three times a day, the afternoon portion of which is fermented. They are allowed to free range in the garden during the day and eat a lot of grass and insects. However, yesterday it went wrong again. I think he is just very sensitive to this, luckily he always recovers after about 10 minutes and is immediately his happy self again. Maybe it can't be solved but I find it so sad when I find him paralyzed...
maybe he has worms? it is rare at ducks but possible. you can give them pill for dogs but double dose (1 pill for 5 kg of body weight instead of 10). I have been doing this for years as I cannot find any wormer for tapeworms for chickens. as they digest food much faster than dogs a double dose is required.