Monsters that create monsters in E6

[Pilo]

Hi,

I am a DM in an E6 game and for a scenario i am looking for references (name and book) of monsters that can create others of the same kind or of a close kind for a level 3-4 game so CR4 or less.

For exemple there are monster with create spawn like :
Vampire
Wight
Shadow

Or monster like :
Ghoul which can turn an other creature into a ghoul by ghoul fever
Lycantropes
Vargouille
Murk (Libris mortis)

Thanks.