After several minutes the Eagles got frustrated and began to attack each
other. They soon began to dive vertically, level out, and attack
head-on in a good old-fashioned game of high-speed "Chicken". Sometimes
they banked away from each other at the last possible second.
Other times they'd climb vertically and tear into each other while
falling back toward the water. (The duck catches his breath at the
right side of this picture.)