Great shots! Sure startled me the first time I saw one a few years ago sipping nectar from a lily not long after I got my first digital camera. Now when I see them, I just watch and enjoy. They've been on my meadow sage and mallow this year so far but even with camera in hand, they moved too quick for me to catch a clear shot. I WS monarda/bee balm last year so I'll have to keep a close eye out for those little guys.

And please don't forget nectar plants. I enjoy visits of both types of Hummingbird moth most of the summer. I don't have their host plants but they nectar each day on various blooming plants. They especially enjoy Butterfly Bush, Lantana and Verbena bonairiensis here in my area. Usually grown as an annual, the Verbena bonairiensis roots overwinter here and begin to put out new growth very early in the spring, so I have blooms of this plant quite early. All the butterflies, moths and bee's love these little blooms. Mary hummingbird moth feeding on the bloom of Verbena bonairiensis

We've had those moths here for years and we enjoy watching them. They're not as friendly as the hummers but never have caused any problems. The hummingbirds are usually here in spring when the flowering crabs bloom, then they're gone and return at hosta blooming time. I had to leave the feeders out for them for a couple weeks and one would stop a couple times and move on, but now they've really started frequenting them heavily. Like you, I also had just wasps and butterflies sitting on them. Now the syrup goes down visibly every day. They must be hungry little devils too because they're even trying to get nectar out of the little clear bulbs on the lights on the bushes around my deck and they buzz around my head checking me out. This is the first time I've had enough of them around me that aren't shy and they sit in the branches of my curly willow and chirp, and they sit long enough I can get a good look at them and see some of them are browner in color, and some have bright metallic green backs. Friendly little things.

There are numerous critters that will eat insect eggs, including ladybugs and other caterpillars. A very small percentage of eggs will make it all the way to adulthood, sadly. To answer your question, the eggs are adhered pretty tightly to the leaf and are not likely to fall off. When the tiny caterpillars hatch, they often feed on the remains of their eggs before starting on the foliage of their host plant. The larva will eat and grow, eat and grow some more until it reaches its full size.....and then drop to the ground to pupate.