[{"Bold_text": "noun", "List Items": ["a small, aquatic, egg-laying monotreme,Ornithorhynchus anatinus,of Australia and Tasmania, having webbed feet, a tail like that of a beaver, a sensitive bill resembling that of a duck, and, in adult males, venom-injecting spurs on the ankles of the hind limbs, used primarily for fighting with other males during the breeding season."]}]