1. Evolution: Sperm Ejection Near and Far
Tommaso Pizzari 
Current Biology 
Volume 14, Issue 13, Pages R511-R513 (July 2004)
DOI: /j.cub

2. Figure 1 Copulation in Drosophila melanogaster.
In this sexually promiscuous species, the last male to inseminate a female has a fertilising advantage. A recent study [7] indicates that this last male sperm precedence may be explained by a combination of sperm aging inside the female storage organs and females voiding their storage organs following a new mating. (Photo courtesy of R. R. Snook.)
Current Biology  , R511-R513DOI: ( /j.cub )