https://www.backyardchickens.com/articles/three-things-you-probably-did-not-know-chickens-couldnt-eat-and-why.69941/
Also
https://www.caffeineinformer.com/caffeine-content/coffee-grounds
This post is from an article on this site:
1. Caffeine
Believe it or not, chickens cannot have caffeine! Let me explain why. When caffeine is drank, it is immediately absorbed. In humans, it stimulates the nervous system, causing them to "wake up" and have more energy. However, because chickens...