This is without using any searching so i don`t know if it`s right or not but here goes,
Billabong,is it something like a small stream or brook which has stuff like crayfish in it?
Only i go fishing and i`m sure i`ve read somewhere about carp being found in Billabongs,destroying the banks and eating all the indiginous fishes food
If someone gave you some "spondoolas",maybe a monkey or a pony what would they be giving you?
