Delmarva Peninsula fox squirrel makes recovery

Trapped in a steel cage barely big enough to hold her, the large squirrel was not happy, pawing at the bars and trying them with her teeth. Matt Whitbeck and Cherry Keller of the U.S. Fish and Wildlife Service were glad to ...

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.

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