Already yesterday night we could see that Kati did not incubate  one egg and so it was in the morning too …

Black stork         Must-toonekurg        Ciconia nigra

There is no answer to the question why.

It is surely not carelessness but there is no evident reason. Does the stork feel that bringing up four chicks would turn out to be complicated?

A similar view this morning . Screencap from webcam  Liz, LK forum

Maybe we will find an explanation sometime?