Who’s the real invasive species: us or them? Ecologists are rethinking urban biodiversity Our cities and suburbs have spiders, rats, raccoons, lizards — and people.

In the 1940s, Ernst Mayr, a German ornithologist, tried solving this problem with a new definition of species based on how animals breed. If two animals couldn’t breed with each other, Mayr ...

Nature is in crisis, and it's only getting worse. As species vanish at a rate not seen in 10 million years, more than 1 million species are currently on the brink.

The Fish and Wildlife Service said 21 species, including a mammal, birds, fish and mussels, are being removed from the endangered list because they're now considered extinct.

The species, including birds, mussels and a bat, have been moved off the threatened and endangered list. They join 650 other species that have gone extinct in the U.S.

At least 35,765 species are threatened with extinction. An update to the International Union for Conservation of Nature's Red List of Threatened Species has declared 31 animal and plant species ...

The Endangered Species Act worked. Thanks to the legislation and the way it has been enforced, today we have the opportunity to watch soaring bald eagles in the lower 48, see gray whales migrate ...

The Trump administration is proposing to significantly limit the Endangered Species Act's power to preserve crucial habitats by changing the definition of one word: harm. On Wednesday, the ...

And 29.7% of all species would be at risk of extinction under a 9.7 F (5.4 C) warming scenario, a high estimate, but one that is possible given current emissions trends.

Divers, underwater submersibles and remotely operated vehicles found 886 marine species over a 16-month period, and they have all been deemed new to science.