Scientists have made a groundbreaking discovery about the unique echidna, revealing that it evolved from a water-dwelling ancestor. According to a new study, the echidna’s powerful digging claws, protective spikes, and highly sensitive beaks were developed millions of years ago when its ancestors splashed through the water.
Researchers found that the echidna’s thin bone walls make it easier for them to walk on land, suggesting they descended from an aquatic ancestor. This finding is unusual because most prehistoric mammals transitioned from land to water, not the other way around.
The study also found that the echidna’s backward-facing hind feet may have developed as rudders to help their ancestors navigate fast-moving waterways. Additionally, echidnas have a “diving reflex” when submerged in water, which helps them conserve oxygen and hold their breath for longer.
This research provides new insights into the early history of monotremes, a rare group of mammals that lay eggs instead of live young. The study’s authors hope to discover other ancestral monotremes to unravel the mysteries of this fascinating group of animals.
Source: https://www.theguardian.com/environment/2025/apr/29/how-echidna-evolved-australia-mammal-study