Monocephalus dipygus parapagus: a suspected case of complete caudal duplication in a British Blue kitten.

Complete caudal duplication is an extremely rare type of conjoined twinning. This communication reports the birth and gross features of a live conjoined British Blue kitten born naturally to a healthy queen. The monocephalic dipygus kitten exhibited a normal skull and upper body, two separate pelves, four hind limbs and two tails. A cleft palate and bifurcation of rostral mandible were also noted. The absence of maternal dystocia was unusual for conjoined twinnings.