From pythons to fungus, species invading US

(AP) -- A pet Burmese python broke out of a glass cage last week and killed a 2-year-old girl in her Florida bedroom. The tragedy became the latest and most graphic example of a problem that has plagued the state for more ...

HOT ISSUE: Should we deliberately move species?

(AP) -- On naked patches of land in western Canada and United States, scientists are planting trees that don't belong there. It's a bold experiment to move trees threatened by global warming into places where they may thrive ...

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 ...

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