Welcome!

If this is your first visit, read the navigation instructions, then choose section 1 to begin.

If you're returning, ask your teacher where to start.

When and why did birds begin to fly?
An introduction.

How did the skeleton change during bird evolution?
This question is explored in living and extinct birds.

When did feathers appear in the evolutionary history of birds?
We'll consider this interesting question—and ask why!

How does a bird flap its wings in flight?
Investigate key evidence in the mystery of flight's evolution.

Assemble all of the the pieces of the puzzle with the
Special Assignment!

Step inside the lab of paleontologist Kevin Padian!