Sayyiduna Abu Waqid al-Laythi (may Allah be pleased with him) said: When the Prophet (peace and blessings be upon him) came to Madinah, the people used to cut off the humps of camels and the fat tails of sheep. The Prophet (peace and blessings be upon him) said: "Whatever is cut from an animal while it is alive is carrion (in ruling)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18924