The tiny White-browed Scrubwren is only 12cm long. Yet  the male bird exhibits some remarkable behaviour when it comes to reproduction.

The White-browed Scrubwren is a cooperative breeder, with the male birds sharing reproduction rights based upon their paternity. 

Jim Butler’s latest issue of Feather Fascination explains the concept of Reproductive Skew Theory. This dictates how the male birds assume their place in the group’s hierachy and it also determines their mating frequency. 

Click here to learn more! 

Image courtesy of Ed Frazer