Misc: What non mechanical sport achieves the highest speeds?

Questions

What is the common name for the furcula in birds?

Which bird is named after its habit of up ending stones to look for shellfish?

Which bird reestablished itself in Suffolk in the late 1940s and is the symbol of the RSPB?

Which bird is stuffed and displayed in the MCC Museumat Lords having been hit and killed by a cricket ball?

On which island off Iceland was the last known great auk killed in 1844?