I found this beautiful Monarch in a field feeding on nectar of this thistle flower last July.
Butterflies have their very own built in straws which is called a proboscis, to sip the nectar. The proboscis can be seen in the following photos if you look closely. They keep their proboscis curled up under their chin and roll it out when they are ready to feed. I was very thirsty when I took these photos and wished that I could join the monarch to wet my whistle, however, after rubbing under my chin, I just couldn't find my straw.
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Information Source: thoughtco.com
Image Source: All photos are my own.