The female Common Kingfisher is identical in appearance to the male except that her lower mandible is orange-red (in stead of black) with a black tip.

The 4th photo shows a male who has caught a fish and is on his way to feed his young in the nest built in a hole in a riverbank in the garden of friends of mine in Vreeland.
The next day the young fledged, never to return to the nest.

First 3 photos: Eemmeer/Eemnesserpolder, Eemnes, The Netherlands, 5 September 2019
4th photo: Vreeland, The Netherlands, 6 September 2014
5th photo: Lepelaarsplassen, Almere, The Netherlands, 9 March 2016