Which of the Following Techniques Was Not Used by Conservation

Multiple Choice

Which of the following techniques was not used by Conservation biologists raising whooping cranes?

A) familiarizing whooping crane eggs with the sound of a plane engine
B) caretakers dressed as whooping cranes while feeding the chicks
C) a whooping crane puppet to guide them through exercises
D) using a whooping crane puppet on a plane to lead them in their migratory route