Birdy is in time, obviously.
But who is not?
I googled that 'time is relative meaning'.
This is the answer I've got:
'Abstractly, I've read that the speed of light is independent of the motion of the observer, that the speed of light relative to an observer is the same regardless of how fast the observer moves. ... This supposedly means that time is relative to the observer rather than being absolute.Feb 2, 2016' by Google