A man came to the Prophet pbuh to ask him to give him a beast to ride. The Prophet pbuh jokingly told him, I will give you the offspring of a she-camel to ride." He said, "O Messenger of Allah (pbuh), what will I do with the offspring of a she-camel?" The Prophet pbuh said: "Are riding-camels born except from she-camels?" [Reported by Ahmad, Abu Dawud and al-Tirmidhi, with a sahih isnad.]