A calf with two faces was born two weeks ago at a Dairy Farm in southwest Virginia. It has two noses, two tongues, and a single socket with two eyes. From the Associated Press:
The calf has two lower jaws, but only one mouth. (Farmer Kirk) Heldreth feeds her through a tube, and acknowledges he probably can't maintain that feeding schedule for long.Link to AP story and ABC News video
The calf was the product of artificial insemination, which was supposed to create a genetically superior specimen. "Genetically, this is one of my better calves," he said...
According to MedicineNet.com, the condition is called diprosopus. It happens when twins start to form and don't completely separate. In most cases, the twins are completely fused with one set of limbs, but part or all the face is duplicated.