Answer:
You can separate them according to the shapes of their beaks.
Some have longer, pointier beaks whilst others have flat and short beaks.
This is because they eat different things: seeds vs worms and insects.
This means that the shape of their beak is an adaptation (it enables their survival) because it makes it easier for them to consume food.
This is known as occupying different niches in the habitat, because even if they all live in one area, they will eat different things, meaning that they will always have enough food to survive.
Step-by-step explanation: