Florida takes aim at cat-eating African lizards

A cat-eating lizard native to Africa is being targeted by Florida state wildlife officials who say the creatures, known as Nile monitors, could be dangerous to pets and people.

A sneaky snake: Teams hunt for rock pythons in Everglades

For all the danger posed to Florida's Everglades by invasive Burmese pythons, there's one thing researchers don't want to know: how they would interact with another python species that threatens to move into the same territory.

Burmese pythons pose little risk to people in Everglades

The estimated tens of thousands of Burmese pythons now populating the Everglades present a low risk to people in the park, according to a new assessment by U.S. Geological Survey and National Park Service scientists.

Earthworm invasion

Beavers reshape landscapes with their dams. Wolves control elk populations. Sea otters protect kelp forests by eating sea urchins. These are what ecologists call "keystone" species: critters that control an ecosystem and ...

The spiralling cost of invasive species

Some aliens arrived as stowaways. Others were brought in deliberately, for fun or profit. And others were so tiny that nobody noticed them until way too late.

Fire ant colonies seem to be down dramatically

The red imported fire ant, one of the most horrifying of the foreign species that have established themselves in the United States, appears to be in retreat.

US bans import of Burmese pythons

The United States announced Tuesday it is banning the import of Burmese pythons and three other species of giant constrictor snakes due to the danger they pose to local wildlife.

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