I though that a branch had fallen from one of the trees. Then it started lumbering across the yard. He was maybe three feet long. It's only the second one I have seen in ten years. They are fast and agile. Even the cats have a hard time hunting them. They are gone before you can get a picture of them. My wife tells me that these are one reason for disappearing chickens.
Only cooler animal I have spotted was the big black snake in a pile of bamboo years ago. My wife said it was not a python, but a cobra from the mountains just above us where there are many like it.
There are stories of crocs turning up on the beaches here, but those are from decades back.