Large Hole In Yard?

[Operation-Goanna]

Excuse me, but there's a awfully large hole in my yard. I know this may not be a herp, but I'm quite sure it is.

I live in Vic.

 

[Wokka]

In Newcastle it could be Mine subsidence??

 

[Operation-Goanna]

Its about 4 inches high, it splits into two smaller holes at about 3 inches in, maybe it's some large burrowing spider home?

 

[Smittiferous]

Fox/rabbit?