Kathir bin Jumhan said: I said to Abu Abd al-Rahman, that is, Ibn Umar (may Allah be pleased with them both) (or someone other than me said): I passed by a dead hen and trod on it, and an egg came out. May I eat this egg? He said: No. Then he asked: O Abu Abd al-Rahman! If I pass by a dead hen and put my weight on it, and an egg comes out of it, and a chick hatches from that egg, may I then eat it? He said: Which people are you from? I said: I am from the people of Iraq.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19696