Birds Can Fly Because:
- They have wings, modified forelimbs adapted for flight.
- Wings are covered in lightweight feathers that provide lift.
- Strong flight musculature enables wing flapping.
- Streamlined bodies reduce drag.
- Hollow bones reduce weight.
Ducks Can Swim Because:
- Webbed feet help propel them through water.
- Waterproof feathers keep them dry and buoyant.
- Streamlined bodies reduce drag.
- A layer of fat insulates them and keeps them warm in water.