No living bird has true teeth in its jaws.

How can researchers estimate Anchiornis feather colors from preserved evidence?

• Compare the surrounding rock color with known colors of living feathers.
• Compare feather lengths and outlines with those of living bird feathers.
• Compare preserved pigment structures with those in living bird feathers.

Which fossil matches the description of short, fuzzy filaments rather than broad flight feathers?

• Fossils of Sinosauropteryx
• The fossils of Microraptor
• Fossils from Archaeopteryx

A Microraptor reconstruction shows long feathers on its arms but none on its legs. Which correction follows from its fossils?

• Move its long arm feathers to its tail, leaving the arms and legs bare.
• Keep its long arm feathers and add long feathers onto both of its legs.
• Shorten its long arm feathers into fuzz, leaving both legs unfeathered.

Sinosauropteryx had short, fuzzy filaments rather than broad flight feathers. Which possible use follows from that structure?

• Forming broad wing surfaces that could support sustained powered flight
• Forming flat paddle surfaces that could push its body through the water
• Trapping air near its body, which could slow the rate of body heat loss

Why can some deposits in northeastern China preserve delicate feather details?

• Fine sediments and rapid burial could help preserve feather impressions.
• Coarse sediment records smaller feather details than fine sediment does.
• Long exposure before burial preserves feathers better than rapid burial.

A display calls Anchiornis the only dinosaur with reported feather color evidence. Which fact requires the label to change?

• Anchiornis also had long feathers on both its arms and its legs.
• Color evidence was reported for Sinosauropteryx and Microraptor.
• Microraptor had long feathers on its arms, legs and on its tail.

A poster shows ground-up and trees-down proposals for flight. Which caption correctly describes their place among scientific ideas?

• Two proposed routes covering all possible starting movements for flight
• Two proposed stages, with running then gliding before flapping develops
• Two proposed routes among others that scientists can test with evidence

A fossil has legs suited to running and feathered arms. Which study would best test whether its wing use could fit a ground-up route?

• Test whether its body and wing model could glide down from tree branches.
• Test whether its body and wing model could slow a fall from a high perch.
• Test whether its body and wing model could gain lift during a short leap.

A display arranges Sinosauropteryx, Microraptor and Archaeopteryx by feather traits. Which label describes what that sorting rule establishes?

• A comparison of feather traits between three fossil species
• A timeline of fossil dates inferred from feather complexity
• An ancestor sequence inferred from feather complexity alone