Monarch Butterfly (Danaus plexippus)http://en.wikipedia.org/wiki/Monarch_%28butterfly%29
This guy was named specifically for a King. A King of Great Britian no less. He was named for King William III of the duo Monarchy of William III and Mary II. Actually very fitting for the name of this Butterfly. William III was of the "House of Orange" in the Netherlands. Hence the name of this Butterfly. This guy is a male. The way to know this is by looking at the lower wings. You will see he has a black mark on the vain on each wing almost looking like a wart!! The Female does not have this marking.
I am so lucky to have a lot of these guys in my garden. More so than most people do in their gardens. At times by the hundreds. The reasons for this are many but the two main ones are: I have a large amount of native plants in the garden, also I have a large amount of Asclepias syriaca:, Milk-weed here as well.
The other is I rarely use insecticide in the garden unless I really have to, and then it is when I can be specific to what needs to be controlled.