All I can think of - from the hen's point of view is - please don't hurt me... Abusive comment hidden. (Show it anyway.)
A teratoma isn't actually an 'embryonic twin'. It is a strange type of tumor in which stem cells differentiate wildly into different tissue types. It is common for teratomas to contain teeth, hair and other familiar structures. Abusive comment hidden. (Show it anyway.) 1 reply