Lot's of good butterfly pictures and links at this USGS page Butterfly Related Websites.
And a description of The Fort Collins Science Center that provides the information.
Most years my wife gets a butterfly house for her students. It's fun to watch the butterflies life cycle...and then to set them free on a warm day.
I love Gabriel Garcia Marquez's description of butterflies. If you have time I highly recommend checking out his writing.
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I started thinking about butterflies this morning because of the spring like sunny and warm weather we are enjoying and after running across this Story with the wonderful title -
"When Yellow Butterflies Flew in From the Mountains"
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ps. I heard part of an NPR program on my way to work, the day after I wrote this post. It's called Living in the Shadow of a Million Butterflies.