I'm not a scientist and what you are reading here are my impressions and observatisons.

Most of a Kingfisher's day is spent flying low over and diving into

shallow waters in order to fish.  This action begins early in the

morning before the sun rises, when there isn't enough light yet to

shoot.  It is interesting to discover that the Kingfisher possesses keen

eyesight, even in the twilight hours, when it is able to successfully

 catch a fish with nearly every dive.

The amount of fish that they are able to eat is relative to its

size and is quite incredible.  Sometimes it swallows the fish whole while

in flight and sometimes it perches on a branch and in quick movements

of its head it brings the head of the fish to the opening of its

throat ready to be swallowed. This is all of course dependent upon the

size of the fish.

In relation to the amount of food it is able to eat, the Kingfisher's

digestive system digests the fish rather quickly.

The Kingfisher's excretory functions are done like most other animals  

even while it is in flight from point to point.  The fish itself is

digested in the intestine of the Kingfisher, however not completely.  The

bones are not digested in a natural manner rather are discarded in the

form of a white mass called Barf Time, through a vomiting process.  The

vomiting process takes roughly 50 seconds from when it opens its

throat while perching on a branch.  In the pictures it is possible to

see this process.

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