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Answer: Corvids
Why: The champion is the Clark's nutcracker, which can carry about 100 pine seeds at once in a stretchy pouch under its tongue.
Answer: Archaeopteryx
Why: The first Archaeopteryx skeleton turned up in 1861 in Bavaria's Solnhofen limestone, laid down about 150 million years ago.
Answer: Air sacs
Why: Air sacs exchange no gas themselves; they act as bellows, and one breath of air needs two full cycles to cross a bird's lungs.
Answer: Their diet
Why: Chicks hatch with grey down and only turn pink after consuming pigments from algae and brine shrimp.
Answer: To kill parasites
Why: The behaviour is called anting. More than 200 species do it, usually with formic acid ants, and no proposed explanation is proven.
Answer: One brain hemisphere at a time
Why: Tagged birds slept only about 42 minutes a day in the air, against more than 12 hours a day once back on land.