Science can only tell us that the egg came from the chicken and the chickens came from the egg. But common sense tells us the cycle must have begun somewhere. No science, just common sense. Walking, now that is an interesting example, since humans seem to have an instinctual knowledge of walking. A child does not need to see adults walk in order to learn how.
Blind kids learn to walk too.
And a bird, hatched in isolation, can still fly. God does know everything, but He is not limited bu what He knows. I would like to suggest that if a Creator exhists, He must have created everything, both the immaterial and the material. Our world is composed of both. A soldier is very material, but he are fights for immaterial reasons.