Mummified Twin.

Mummified Twin.
This cat-size (gestational age approximately 4 months) mummified was delivered at term when parturition and labor were initiated by the normal twin. This is a rare occurrence in cattle in contrast with the delivery of occasional mummified fetuses in litter bearing species such as the pig. If the surviving fetus is a female she may be a freemartin if the mummy is a male.

Roberts SJ (1973)