Has the Earth's sixth mass extinction already arrived?

With the steep decline in populations of many animal species, from frogs and fish to tigers, some scientists have warned that Earth is on the brink of a mass extinction like those that occurred only five times before during ...

'Lost' pigeon found after more than a century

A September expedition to Papua New Guinea confirmed via video the existence of the black-naped pheasant pigeon, a critically endangered species that has not been reported for 140 years.

Some endangered sawfishes are having babies, no sex required

Some female members of a critically endangered species of sawfish are reproducing in the wild without sex. The discovery, reported in the Cell Press journal Current Biology on June 1, marks the first time living offspring ...

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