While werewolves are the stuff of folklore, the light and the gravitational pull of the Moon do have real effects on the behaviour and physiology of a host of earthbound organisms — including, perhaps, people. Moonlight can also change animal behaviour. Many marine organisms move up and down in the sea depending on the level of moonlight in order to keep their light levels constant. On land, some nocturnal animals come out on a well-lit night to hunt , others stay hidden to avoid predators.
The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun’s disk disappears below the horizon in the west. There are few things in nature as photogenic as the sky at sunset, especially animals. The rich bright gold, pink and orange colors make unusually beautiful pictures of animals illuminated by the sun.