what animal can attack chickens in australia

Today I found one of my silkies chicks have been injured by animal bite in the garden yard within about 1 metre garden fence during daytime(about noon).

I could not see, but it was very fast and runned away under about half metre bush/shrub.

I will be very appreciated for any advice or expertise on chicken attacking Ausssi animals in order to prevent such attack again or catch and destroy it(them).

Anyway have a happy Easter long holiday.


Regards,