Lepi-links...
There are many excellent websites and single pages pertaining to Lepidopteran critters--the butterflies and moths. I have listed a few here and will be adding more as I run across them. If you have a favorite Lepi-website, send me the link!
My favorite reference site for all things "butterfly":
http://www.learnaboutbutterflies.com/
Did you think, as I did, that chitin is always hard and inflexible?
It's not!
https://en.wikipedia.org/wiki/Chitin
Nice description of butterfly development:
http://www.straightdope.com/columns/read/2801/how-exactly-does-a-caterpillar-morph-into-a-butterfly
The stages of caterpillar growth:
https://www.learner.org/jnorth/tm/monarch/LarvaInstar.html
Amy from New Orleans suggested this excellent page which describes how to
create a butterfly garden and provides many additional links on the subject:
www.avasflowers.net/a-guide-to-butterfly-gardens
Ava passed along this link to another excellent page that describes how to build a butterfly garden in your back yard:
https://www.homeadvisor.com/r/how-to-build-backyard-butterfly-garden/
Jamie and Lisa sent a link to an informative page that describes which plants can be used to attract pollenators, including butterflies, to your garden:
https://www.fragrancex.com/fragrance-information/flower_fragrances_that_attract_bees_and_butterflies_to_your_garden.html
Hazel provided these four links:
Butterfly Conservation's websites:
https://butterfly-conservation.org/
Collection of butterfly resources,including species, glossaries and
general knowledge:
https://www.wirefence.co.uk/lepidoptera-resources/
Free butterfly printables for educational use:
https://www.hawaiianshirtsonline.co.uk/free-butterfly-printables/
A page dedicated to Monarch butterflies:
https://www.monarch-butterfly.com/
Kelly, Lacy, and Layla provided a link to an
excellent website that describes how to create backyard habitats for various types of wildlife,
including butterflies:
https://www.angieslist.com/articles/creating-wildlife-habitat-your-backyard.htm