I don’t know much about the Sacred Kingfisher but have noticed that they tend to perch higher up in trees than the Azure which will perch & fly much closer to the surface of the water where we live.
It is the jewel like iridescence & deep rich colours that I appreciate. Birds are like kaleidoscopes, the variation is complex & beautiful. Although related to the Kookaburra the much smaller Kingfishers are very quiet & much more timid when it comes to humans.
Their aerodynamic design has been replicated & incorporated into the bullet trains of Japan. Nature (God's creation) is over flowing with a magnitude of wisdom from which we copy from.
Bird’s head inspires Bullet Train efficiency (scroll down the page)