Note: These Challenge Questions coincide with the Spring 2006 Reports Challenge Question #1 From: Janice Morgan <jdmemail@msn.com> Date: Fri Feb 17 2006 - 12:53:17 EST I think the variables that affect the number of robins in winter time are: food supply (berries, worms, bird feeders, etc.), water supply, and good shelter. I think severe weather may also affect robins.   Corey M. Received on Fri Feb 17 12:53:25 2006 Copyright 2006 Journey North. All Rights Reserved. Please send all questions, comments, and suggestions to jn-help@learner.org