Misc: who portrayed the birdman, in the movie birdman of alcatraz?

Questions

For making what is the abalone shell used?

What African republic's name was inspired by its thriving elephant tusk trade?

'summer of 69' was a hit for which canuck in 1984?

A method of resolving questions of conscience by applying moral principles or laws to concrete cases?

in the monty python parody 'search for the holy grail', what did arthur's servant use to make the sound of horses hooves?