Birds spend weeks preparing for the intense journey by gorging on large quantities of food, sometimes doubling their weight prior to departure.
While flying, birds can lose almost one percent of their body weight an hour, so packing on the pounds is crucial to their survival.
However, more than the physical stress, migrating birds are now facing a new source of hardship: landscape change.
Just imagine you're the one getting ready to take a trip.
You've packed the car with everything you think you need, fueled up the tank, eaten a huge breakfast, and hit the road.