New fossil evidence suggests echidnas evolved from a water-dwelling ancestor, not a land-based one. The bone structure ...

Analysis of the fossil suggests that the only two egg-laying mammals, platypuses and land-based echidnas, both descended from ...

Alligators can live on land and in water, but that doesn't mean they can breathe underwater like fish. But how long can alligators stay underwater? And how long can they hold their breath? Let’s find ...

We may have gotten the evolutionary origins of the echidna backward, as new research suggests its ancestors probably lived in ...

New analysis of a 100-million-year-old fossil embedded in a rocky cove in Australia suggests echidnas may have evolved from ...

In the waters off New England, one of Earth's rarest mammals swims slowly, mouth agape. The North Atlantic right whale ...

A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding ...

A 31-foot sperm whale at risk of death washed up on Hilton Head Island on Saturday evening, drawing a crowd of onlookers to ...

Since late February, more than 800 poisoned animals have been reported in just Los Angeles and Orange counties.

"We’re talking about a semiaquatic mammal that gave up the water for a terrestrial existence, and while that would be an extremely rare event, we think that’s what happened with echidnas ...

Australia's burrowing echidna evolved from a water-dwelling ancestor in an "extremely rare" biological event, scientists said ...

Australia’s burrowing echidna evolved from a water-dwelling ancestor in an “extremely rare” biological event, scientists said ...