Huge Grey Bird sighted in Backyard!

Grace saw an enormous bird in the yard this morning, it was grey. It was as big as a giant - so big. It had a really long tail, and the dogs chased it away, then they jumped into their little beds for morning nap.Doug & I thought it might be a Heron. Grace is absolutely sure it was much larger than a heron. We have a lot of wildlife in the backyard as the mulberries out. Wicked Currawongs, destroying nests all about (just ask the sad top-knots) and Red-eyed cuckoo shrieks and king parrots. Last year the King parrots got all Doug's corn as he didn't have the heart to pick it from them. We sort of felt proud that they were making our backyard their home. There have been sightings of echidnas (technically the frontyard) and a large fat, fluffy possum eating the last of our naval oranges, peering down with bright red eyes.