Blue is always getting pushed. Migratory birds put on fat before the flight to have the energy required for the journey and hibernating species do the same so they can afford to eat very little during winter.
That must be a very delicate balance since it must expend more energy to fly if the bird is heavier.
But I remember hearing about the amazing migratory flights of some small birds that they conquer in under two days, which would imply they were flying 35mph nonstop with no breaks. So it must be working well for them.
They become pretty fat, so the energy storage outweighs the increased consumption. I can always tell when they are about to leave because they are significantly round.
Blue is always getting pushed. Migratory birds put on fat before the flight to have the energy required for the journey and hibernating species do the same so they can afford to eat very little during winter.
That must be a very delicate balance since it must expend more energy to fly if the bird is heavier.
But I remember hearing about the amazing migratory flights of some small birds that they conquer in under two days, which would imply they were flying 35mph nonstop with no breaks. So it must be working well for them.
They become pretty fat, so the energy storage outweighs the increased consumption. I can always tell when they are about to leave because they are significantly round.
Plus lots of animals like polar bears both put on fat and become dormant.