Empress Leilia larvas feed on hackberry plants. Amazing how different they look from above and below.
Viceroy, photo by Ned Harris, 4/2/11
The Viceroy larvas (look like bird poop and) feed on willows and cottonwoods. Here's a fun fact: The larvas store the salicylic acid from the willow bark in their bodies. Tastes yucky to predators. Good survival strategy. All photos from Ned Harris.