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.

Pythons apparently wiping out Everglades mammals

A burgeoning population of huge pythons - many of them pets that were turned loose by their owners when they got too big - appears to be wiping out large numbers of raccoons, opossums, bobcats and other mammals in the Everglades, ...

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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