Elizabetha Covers Some Ground; Enters North Dakota

Don writes....

"Elizabetha flew 274 km (170 mi) into the eastern part of North Dakota, and roosted overnight approximately 130 km (81 mi) west-southwest of Grand Forks; the signal wasn't received soon enough for David Lambert in Grand Forks to try to locate her, but maybe she'll remain within range tomorrow morning."

So she is moving seriously to the north once again. One can't help but wonder what makes her fly a good distance one day and hold up another. What are the factors influencing her decision to cover alot of ground? Photoperiod? Hormones? Senses we can't yet conceive of?

For us, this one of the classic recurring questions.

She seems to have slept in an open field, once again near a small lake. Perhaps even on the ground.