
When birds live on an island where there are no predators, their wings tend to shrink and they lose the power of flight.
The reason being is that flight takes up a lot of energy, requiring the bird to eat more food.

When birds live on an island where there are no predators, their wings tend to shrink and they lose the power of flight.
The reason being is that flight takes up a lot of energy, requiring the bird to eat more food.