| Traditionally, cases of superfecundation have been discovered by the starkly different appearances of twins. |
| The scientific term describing fraternal twins by different fathers is heteropaternal superfecundation. |
| The phenomenon, known as superfecundation, usually results in the second baby dying as the older gets better nourished in the womb. |
| Superfetation is more rare than superfecundation. Only a couple of cases have been described. These superfetation cases were both homopateral. |
| Monopaternal superfecundation is probably much more common because under normal circumstances it is not recognized. |
| Obviously, the twins resulting from superfecundation are dizygotic. |
