Good habitat has not-too-salty water for blue crabs and fresh water for cranes to drink. A crane in flight uses an estimated 19 times more energy than a crane at rest. If cranes must fly far to find fresh water, they use precious energy and may lose weight.
Image: Eva Szyszkoski
![Whooping crane takes off from marsh](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/crane/310_takeoff_2010_eva.jpg)
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