The latest research suggests that echidnas and platypuses originate from an aquatic ancestor, rather than a terrestrial one, ...

That’s exactly what happened in Australia’s Lightning Ridge opal fields in New South Wales, where scientists unearthed fossils of a prehistoric monotreme nicknamed the echidnapus. This amazing ...

University of New South Wales. "'Extremely rare event': bone analysis suggests ancient echidnas lived in water." ScienceDaily. ScienceDaily, 28 April 2025. <www.sciencedaily.com / releases / 2025 / 04 ...

Six monotremes living in the same place at the same time, 100 million years ago at Lightning Ridge, NSW ... now known from additional opalised fossils; Parvopalus clytiei, the smallest monotreme ...