This cow from my parents' ranch gave birth to a set of twins.  The small dark one in the back is a little heifer, and she was born first.  The larger spotted one in the front is a bull calf born three days later.  The twins are the spitting images of their dads--and they don't have the same dad.

The cow may look old, but that is just the result of trying to feed two fast growing babies at once.  My parents are very pleased with her; they have had twins born in the past, and the mom cow either rejected one or both of the babies.  This cow (who used to be called "Dummy" but isn't anymore) has done a very good job with both of her babies.