What are categorized as the biological class "aves"?

More Questions:

Which Canadian city is host to the Canadian International Autoshow?

What is the name of Spain's famous cold soup made mostly from tomatoes?

Which car is considered to be the first hot hatchback, introduced in the 1970s?

What sports team used the Swinging Friar as its team emblem until 1984?

What is known as a "Magnum Opus"?

From what language did English borrow the word "zero"?

Which Washington, D.C. street is often used as shorthand for the lobbying industry?

Bronze is an alloy of what two metals?

What is "bovine spongiform encephalopathy" more commonly known as?

Which singer played a fashion model in the 1975 movie "Mahogany"?

What actress shaved her head for her role in the movie "Anna and the King"?

Gregory Peck played Lt. Joe Clemons in what 1950s film?

In what film is General Jack Ripper obsessed with America's "precious bodily fluids"?

'Video Killed the Radio Star" was the debut music video on which channel in 1981?

What connection did Thomas Edison have with the construction of Yankee Stadium?