Despite evidence that the earliest examples of creatures such as mammals and reptiles gave birth to live young, they actually may have laid eggs, a scientist argues. "These eggs are probably out there ...

An expedition through an unpredictable, perilous mountain range in Indonesia’s province of Papua led to the rediscovery of a critically endangered egg-laying mammal that hasn’t been seen for more than ...

If you are reading this, you did not start your life by hatching from an egg. This is one of the many traits that you share with our mammalian relatives. A new paper in this week’s PLoS Biology ...

Attenborough’s long-beaked echidna, which was thought to be extinct, has stunned scientists after being filmed in a tropical forest in Indonesia for the first time. The egg-laying mammal, named after ...

But in the evolution of mammals, there's a longstanding "chicken and egg" question, or rather, a milk and egg question: What came first in the mammalian lineage — genes involved in lactation, or the ...

This year's winners include an experiment that unboiled an egg, a study that tested how long it takes mammals to empty their bladders and other strange breakthroughs that sound like bar bets. CNET ...

Contrary to popular belief, female mammals produce new eggs after birth, a new study in mice suggests. Male mammals continually produce sperm from a store of stem cells. But since the 1950s, ...

IT IS a chicken and egg question – did mammals evolve nutritional milk before or after they abandoned yolky eggs? “Milk was originally for egg wetting,” says Henrik Kaessman at the University of ...

Echidnas are one of the only egg-laying mammals on the planet. Unfortunately, a group of the spiny critters chose a farmhouse in the Australian outback to mate and the scraping of their porcupine-like ...