Thank you for your help! I know that these images are not of the best quality, but I am eager for an ID. I have looked all day without any success.

I found this caterpillar on a tree that I have yet to identify (I believe it may be a birch of some sort), at around noon of a sunny, warm day. The caterpillar was resting on the top of the leaf, which was slightly curved inward. I could see five or six thick strands of silk that were curving the leaf, and the caterpillar sat underneath them. The leaf was still rather open though, not like the leaf roller tunnels I have seen. The caterpillar has two pairs of red and yellow knobs/bumps near its head, which is yellow with red stripes. It also has a red pointed rump, but its tail is not as pronounced as those found on sphinx moth caterpillars.