HOW DO BIRDS FLY?

I am often wondering about this. I asked Mummy the other day, "Why is it that birds can fly when there is gravity?" It was good to read about it in my Usborne Pocket Scientist book. I learned that it is the shape of the birds wing that helps it to fly. The shape is called an AEROFOIL. The way the air goes over and under this shapes helps the bird to lift off the ground.

We tried an experiment. We made an aerofoil shape and hung it from a piece of cotton. We then blew across the top to see if it would move upwards. It didn't actually work but I did get an idea of what should happen. We watched a funny clip on YouTube all about aerofoils.