Avocados - contain a toxic compound called persin, which can be harmful to chickens.

Chocolate - contains theobromine, a stimulant that can be toxic to chickens.

Alcohol - can cause drunkenness and liver damage in chickens.

Raw or undercooked beans - contain lectins and phytates that can inhibit nutrient absorption.

Green potatoes or tomatoes - contain solanine which is toxic to chickens.

Rhubarb leaves - contain oxalic acid which can cause kidney damage.

Meat or Dairy - These food items can cause health issues like diarrhea and other digestive problems.

Persimmons - contain tannins which can cause intestinal distress.

Apple seeds - contain small amounts of cyanide which can be toxic.

Onion and Garlic - Can cause anemia and other health problems in chickens.