Departure Log Whooping Crane Western Flock Instructions: Once (or twice) a month in spring, Biologist Tom Stehn flies over the Refuge in Texas to count the cranes. Using Tom's counts, you can record how many whooping cranes are still on their wintering grounds in Texas and how many are already migrating. Date of Tom Stehn's Aerial Flight Not Migrating Record number of Cranes Counted (not yet migrating) Migrating (Subtract from the flock's size.)                                         Search Journey North Copyright 1997-2012 Journey North. All Rights Reserved. Questions or comments? Contact us.