The Kingfisher

Edward Lear's 

According to the ancient Greeks, kingfishers built their nests on a raft of fish bones and, having laid their eggs, they set the nest afloat on the Mediterranean sea and incubated the eggs for seven days before and after the winter solstice.

In order to facilitate this it was said the gods always made sure that the seas and winds were calmed during this period. The Greek name for Kingfisher is halcyon, leading to the term ‘halcyon days’ which was originally a reference to the calm and fine weather at this time in Greece.