Displacement experiments of migratory animals involve taking…

Displacement experiments of migratory animals involve taking animals from one location to another (usually one that is not super close).  The researchers then track the animals to see if they can correct for their new position to reach a seasonal goal location (such as their wintering or breeding grounds).  For animals that solely use compass orientation for migration, what happens in these experiments AND WHY? (2 sentences)

You are talking to your brother about this class and you men…

You are talking to your brother about this class and you mention that when you were learning about anti-predator behavior that you learned about a case with tree frogs in which their eggs can flee in response to predation.  He says “How can an egg flee?”.  Briefly explain how the system works to him (1-2 sentences)