One day a Jewish person came to Imam Ali (A.S). He was planning to ask Imam Ali (A.S) such a question, which would take Imam Ali (A.S) a long time to answer and because of that his noon Prayers would be delayed.
He asked, "Imam Ali you say you know everything in the world, then tell me which animals lay eggs and which animals give birth to their young ones."
Imam Ali (A.S) looked back at him smiled and said, "The animals that have their 'EARS' outside their body give birth to their young ones and the animals that have their 'EARS' inside their body lay eggs."
Ref: Shia.es
Lay Eggs - Islam Guidance
