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Hunting an owl to save an ecosystem We follow an owl researcher into California's redwood forests at night, hunting barred owls that threaten to disturb the ecosystem and the iconic spotted owl.

Flying slowly and silently through the night sky, barn owls are majestic nocturnal hunters that successfully prey on rodents scurrying along the ground below. Scientists have long puzzled over a ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Flying slowly and ...