The biggest birds that ever lived were nocturnal, say researchers who rebuilt their brains. Madagascar’s extinct Elephant Birds stood a horrifying 12 feet tall and weighed 1,400 pounds. Scientists thought they were day dwellers like their emu cousins, but found new clues in their olfactory bulbs.

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The biggest birds that ever lived were nocturnal, say researchers who rebuilt their brains. Madagascar’s extinct Elephant Birds stood a horrifying 12 feet tall and weighed 1,400 pounds. Scientists thought they were day dwellers like their emu cousins, but found new clues in their olfactory bulbs.