This Checkered keelback was an unexpected visitor to our houseyard. Its normal habitat is in or near lakes and rivers, where it lives mainly on fish and frogs.
It is a most attractive visitor and, I believe, is not venomous. I have read reports, though, that it has a severe bite, which it will administer with significant enthusiasm if it feels threatened.
This visitor was about 1.5 metres long, and about the same diameter as my wrist.
Sharp-eyed folks will see a crude attempt at a selfie in its eye:
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