It could be a hummingbird clearwing moth caterpillar. I used my computer to zoom in on your picture, but still couldn't tell if the spiracles/breathing holes have an orangey ring of color around them. I also couldn't see if yours has a yellow ring around its "face". There are many different types of hornworms, many very similar to each other. Of course, if yours is an early instar/stage, it might not have those characteristics, because it's too young. If I were you, I'd offer it clean viburnum leaves - no spiders on them, please :) - if you have some, and if you don't you could try honeysuckle leaves. I can't tell the size of your caterpillar by the picture, and even if I could, unless I can ID it for sure, I wouldn't know what the likely instar (stage) might be. When your caterpillar has gone through its instars and is through eating, it should spin a "weak cocoon" amongst leaves, according to my best caterpillar book, if it's a hummingbird clearwing. The moth should emerge this year sometime, just when, I don't know. Sorry I can't be more specific, but a closer-up picture would help. Sherry

Keeping the pupae out of the sun, occasionally hydrate it by bathing it in cool water will help. Like Molanic, I often keep mine in the fridge in a Glad container on paper towel and take it out once a month or so to give it a bath. It is essential to keep them somewhat hydrated in order to avoid dessication. When day and night temps are warmer in later spring/early summer, bring them outdoors in a container with air holes and some sticks they can climb onto when they emerge. They have to hang from the sticks for some time to dry and inflate their wings. This is a good time to get photos of them, too. I only get Hemaris diffinus - Snowberry Clearwing, and their favorite food in my yard is my yellow Honeysuckle. I have Japanese purpurea, but have never found them on this. Another excellent host plant to check is Virginia Creeper. Numerous sphinx moths use it as a larval host, like Eumorpha achemon (Achemon sphinx), Eumorpha pandorus (Pandora sphinx), Darapsis myron (Virginia Creeper sphinx), Amphion floridensis (Nessus sphinx), Deidamis inacriptum (Lettered sphinx), Hyles lineata (White-lined sphinx), and Specodina abbottii (Abbott's sphinx), to name a few. I have raised the first 4 named above, and perhaps one day, I'll find a few others. Good luck and have fun! Susan

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.

Nice photo! I've seen them too. Being protected from predators by their resemblance to bumblebees they fly in the daytime, not evenings as other hummingbird moths do. In fact that's how I saw my first one. I was watching bumblebees working over some flowering plants and all of a sudden I saw this one that was slightly different. Honeysuckle is one of the host plants for larvae. Thanks for posting!