As species recover, some threaten others in more dire shape

Concealed behind trees near Lake Michigan, two scientists remotely manipulated a robotic owl on the forest floor. As the intruder flapped its wings and hooted, a merlin guarding its nest in a nearby pine darted overhead, sounding high-pitched, rapid-fire distress calls.

from Phys.org - latest science and technology news stories https://ift.tt/Hguo4xk

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