I went with the line from the movie Oh God. George Burns (God in the movie) said it was his one mistake. I had not thought of a platoupusese,probably because I can’t spell it.
One of my kids did a school project where they researched an animal they felt was different/unique. He came up with the platypus. I didn’t believe the whole venom part myself and actually checked his research.. sure enough, they have venom. LOL!