Invasive species often start as undetected 'sleeper populations'

When an invasive species overruns a new ecosystem, it is often assumed that the invader recently arrived at its new home and rapidly took over. But a new report in the journal BioScience finds that many new arrivals aren't ...

What wolves' teeth reveal about their lives

UCLA evolutionary biologist Blaire Van Valkenburgh has spent more than three decades studying the skulls of many species of large carnivores—including wolves, lions and tigers— that lived from 50,000 years ago to the ...

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