Funny Mommy cat calling her kittens

The story!
Our 2 kittens are born outdoors. After we discovered that the mother got kittens. We tried to take them inside so we could take care of them. Not right away, of course. But because the mother had saved them such a small place that no one can reach them. I found out they came out if we played cat sounds.
We managed to get them safe inside ..