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Preparing for Migration Keeping Crane Chicks Healthy Back   Here's what's happening, and why: 16-day-old chick Whooper chicks get weighed every day for 7 days and then every week. Biologists want to make sure they don't grow too fast. If they did, their legs couldn't hold them up, and they wouldn't survive a migration. From 10 to 30 days of age, they may grow half an inch or more and gain 10% of their body weight each day! Journaling Question If you grew as fast as a young Whooping Crane, how tall would you be in a week? How much would you weigh? Photo Credit: Patuxent WRC Journey North is pleased to feature this educational adventure made possible by the Whooping Crane Eastern Partnership.