Godwit

Today I read in EENADU newspaper about a bird called GODWIT.

Godwit has started its journey from Alaska to NewZealand's (11500km) with speed of 56kmph.
It had travelled without taking stop in the journey for 9 continuous days.
Wats about food? sleep?
It didnt take food and its weight decreased to half by the end of journey.
It slept in the journey. but??? for some time with one eye and for sometime with the other.
That means while half of its mind had taken rest while the other half was working.
And in the day it had depend on Light rays and in the nightr on Stars for direction.
Even when the climate was cloudy it didnt miss its route. Greatnaa....

Onemore thing it had travelled all the way on Pacific sea. so there was no chance of taking stop.

How did we know that whether it had taken food or stop? Did somne one flied along with that?
Our scientists had tied an electronic tag to that.
and Satellites and computers helped to to trace what was going on.