Is it safe for the hens to eat Woodlice, Worms and Slugs?

Yes, earthworms in particular can harbor roundworms and other chicken parasites. However, as long as you watch out for any signs of internal parasite infestations (worms in the droppings, lethargy, emaciation, etc.), and de-worm if necessary, it is fine to let your hens eat whatever insects they want. I let mine eat plenty of earthworms, and have never had a problem. Besides, they love it!

 

Woodlice, worms, and slugs are usually fine for chickens to eat. In the wild, chickens would eat all of these things. They can harbor parasites like tapeworms that require an intermediate host, however. Just keep an eye out for any signs of your chickens having worms (lethargy, weight loss, etc), and worm if necessary. Hope this helps!