Geologist analyzes earliest shell-covered fossil animals

The fossil remains of some of the first animals with shells, ocean-dwelling creatures that measure a few centimeters in length and date to about 520 million years ago, provide a window on evolution at this time, according ...

Power struggles are best kept out of the public eye

For animals, prevailing in a fight affects their likelihood of winning future conflicts. The opposite is true of losing a fight. The sex hormone testosterone is often believed to mediate this "winner effect". Researchers ...

Tasmanian devils born on Australian mainland in rewilding push

Tasmanian devils have been born in the wild on Australia's mainland 3,000 years after the marsupials disappeared from the continent, conservation groups said Tuesday, raising hopes that a major rewilding effort could succeed.

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