What a great shot of kids in a bright yellow seat having a great time!! Great gesture and color.
Chris, the high warm humidity of butterfly habitats can be challenging, especially if you come in from a much cooler, drier environment. I did this in upper Michigan years ago, and promptly not only fogged the front element of my lens but my viewfinder and that didn't clear until I left the habitat and got a nice fan to blow dry air across my optics. I made the mistake of getting back inside my truck after being out in deep cold in Bosque and exhaling near the front lens of my 500mm F4 and promptly coated its front element with a thick layer of frost - that has to be melted to be ridden of.
What I do now, is try to keep my camera inside a plastic bag or dry bag or a camera case until it has stabilized at the newer warmer temperature inside the habitat before exposing the camera to the new environment - kind of like when you've been out shooting in the cold in winter, and then go back inside a nice warm humid home - keep the camera in case until it reached the new temp. When your camera is deeply cold soaked - you've been outdoors in Yellowstone in February all day - this can take several hours, but when it is 50º outside and 80º and humid in the butterfly habitat keeping the camera in a THIN bag inside your coat, it will come up to the new ambient in just 10-20 minutes and you can then begin shooting. You can also take a small piece of soft leather chami to dry the front surface of your optic. I learned this trick from Marc Muench - just make sure you chami is new, clean, soft and dry. Or a micro fibre cloth might work also. But usually in a butterfly habitat, you have to wait for your equipment to thermally equilibrate, or new moisture will just replace what you have dried off.
I visited the tropical Butterly habitat on Mackinac Island https://www.originalbutterflyhouse.com in October of 2005 and experienced the fogging you mentioned in your post - but I finally did get my len dried off - I brought the wrong lens for butterflies - an f2.0 135 mm prime - in my first foggy experience photographing butterflies. I did capture some owls though at f2.8. - duh. This RAW frame was never processed ( resting undistrubed in my image files ) until today in LR
Let's see if Denise will post some more of hers - they are lovely, I'm sure!