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Description
Let's compare the sizes of the boreal owl and the great grey owl. The boreal owl weighs about 3.3 to 7.6 oz, and its wingspan can exceed 50 to 62 centimeters long. It's a small predator of rodents and other small mammals. The great grey owl weighs about 580 to 1,900 grams, and its wingspan can exceed 152 centimeters long. Thus, making the great grey owl bigger than the boreal owl. Great grey owls have an excellent sense of hearing.

Description
Let's compare the sizes of the boreal owl and the great grey owl. The boreal owl weighs about 3.3 to 7.6 oz, and its wingspan can exceed 50 to 62 centimeters long. It's a small predator of rodents and other small mammals. The great grey owl weighs about 580 to 1,900 grams, and its wingspan can exceed 152 centimeters long. Thus, making the great grey owl bigger than the boreal owl. Great grey owls have an excellent sense of hearing.