Bradley C. Livezey, 56, died in a car crash Feb. 8 2011. Livezey knew nearly everything about the songs of birds and was considered the top anatomist. Livezey, curator of The Carnegie Museum of Natural History, never gave up researching unsolved mysteries of the world’s 20,000 or so avian species. Carnegie curator since 1993, Livezey oversaw a collection of nearly 195,000 specimens of birds, the country’s ninth largest. Livezey died in a two-car crash on Route 910, authorities said. An autopsy revealed he died from injuries to the head and trunk, the Allegheny County Medical Examiner’s Office said. Northern Regional Police are investigating.