HEITI PAVES / SCIENCE PHOTO LIBRARY HEITI PAVES / SCIENCE PHOTO LIBRARY
Boreal owl (Aegolius funereus). This small nocturnal owl (around 25 centimetres long) is also known as Tengmalm's Owl. It is found in dense coniferous forests and mountain ranges across northern North America and Eurasia. It feeds mainly on small mammals such as voles.
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