I have some black oil sunflower seeds (they're not very large seeds) that I feed the wild birds with. I heard that it's a good winter treat for chickens, but I was wondering: should you feed them with the shells or without? I have been researching the subject but the articles don't specify. Bing AI said to take the shells off because they're a choking hazard, but then gave me a photo of some chickens eating them shell on 
Thoughts?

Thoughts?