Native red squirrels are being outcompeted by invasive grey squirrels.
Scott M Ward / shutterstock
Major new 'State of Nature' report shows wildlife numbers still falling but conservation measures can work.
Water rats in Western Australia are safely hunting cane toads.
When neatly dissected cane toad corpses began turning up next to a creek in the Kimberley, scientists went on the hunt for the clever killer.
Extreme flooding during Hurricane Maria in 2017 was hazardous for the Puerto Rican people. But a new study finds that it helped native fish populations rebound after years of drought.
AP Photo/Alvin Baez
Big storms with lots of flooding, like hurricanes Dorian and Maria, actually restore the Caribbean's delicate balance between native and nonnative fish species, new research finds.
The African clawed frog.
What was particularly interesting about the responses of the tadpoles was that they were similar even through they had very different evolutionary histories with the three species we chose.
Untitled. 2015. Pen and Ink on Paper. 60 x 71 cm.
Ernst van der Wal
Beautiful art can provide hope and healing.
Wild boar in a swamp in Slidell, Louisiana.
AP Photo/Rebecca Santana
Feral pigs are a destructive invasive species across much of North America. In a recent study, forest patches where feral pigs were present had fewer mammal and bird species than swine-free zones.
The fate of deer carcasses is a crucial consideration in monitoring the success of future culling.
The NSW government has announced plans to remove feral deer from its list of official game animals. With careful monitoring, the resulting free-for-all could help curb their booming numbers.
The rapid invasion is a major threat to the environment and rural people’s livelihoods.
They swim, they eat, they multiply.
Parakeets from South Asia have established themselves in London.
Guy RD / shutterstock
Alien species are more likely to survive in a new habitat when environmental conditions are similar to their native home.
Barking Owls are one of Australia’s 1,770 threatened or endangered species.
Invasive species are the biggest single threat to Australian plants and animals.
Carnivorous bullfrog tadpoles don’t even spare their own.
A new study reveals that it’s not only adult bullfrogs that pose a threat but their tadpoles do, too.
Argentine ants are a fact of life in many parts of Australia, but can still potentially be banished from Norfolk Island.
Invasive pest ants cause billions of dollars worth of damage to crops, and threaten some of Australia's World Heritage rainforests. The federal budget has pledged nearly $30m on wiping them out – but how?
Phragmites, an invasive species, line this marsh at Sachuest Point in Middletown, Rhode island.
Phragmites australis, an invasive reed, has taken over wetlands across the US. But it also stabilizes shorelines and harbors many fish and birds. Is it time to compromise with this alien?
The Mossy Red-eyed Frog is among hundreds of species threatened with extinction at the hands of chytrid fungus.
Jonathan Kolby/Honduras Amphibian Rescue and Conservation Center
Chytrid fungus has caused declines in 501 amphibian species, according to a new analysis. Most of the damage happened in the 1980s, before the fungus itself was even discovered.
Fire ant stings can be deadly to people who have an allergic reaction to their venom.
Forest and Kim Starr/Flickr
Invasive tropical fire ants spread by eating their fat useless sons.
Fire has burned through a swathe of the Tjoritja National Park.
Tasmania wasn't the only part of Australia that burned in January. The remote interior near Alice Springs saw a huge blaze, worsened by invasive buffel grass.
There are 130 billion gallons of water in Wisconsin’s Lake Mendota, and now, trillions of spiny water fleas.
It's cheaper to prevent biological invasions than to react after they happen. But it's hard to detect invaders while there are still just a few of them. Knowing when and where to look can help.
Spawning sockeye salmon make their way up the Adams River near Chase, B.C.
THE CANADIAN PRESS/Jonathan Hayward
Populations of freshwater species are in a state of deep decline. But we know why and we can reverse the trend.
In the firing line.
We need to learn to coexist with wildfires the way many ecosystems do. We won't protect lives in the long term by trying to stamp the fires out.