Flight Formation: The Vs Have It!
http://www.learner.org/jnorth/tm/crane/FlightFormation.html
Flying With Ultralights: Working in Pairs (scroll down to the section)
http://www.learner.org/jnorth/tm/crane/FlightFormation.html
How Birds Fly: An In-Depth Journey North Lesson
http://www.learner.org/jnorth/tm/crane/flightlesson.html
A Day in the Life of a Migrating Whooper
http://www.learner.org/jnorth/tm/crane/MigrationDay_BJohns.html
Off to
http://www.learner.org/jnorth/tm/crane/jr/FlightSchool.pdf (booklet)
http://www.learner.org/jnorth/tm/crane/jr/FlightSchool1.html (slideshow)