Although this photo wasn't taken in the canyon, White-lined Sphinx Moths do frequent the flowers there. They are sometimes mistaken for hummingbirds and are often called 'hummingbird moths'. Very cool critters. Here's more info.
Violet-crowned Hummingbird, photo by Ned Harris, 3/30/11
This beauty really is a hummingbird and has been sighted multiple times in the canyon since the first post. S/he wasn't banded, though, during the session on 4/2; we'll hope for a bird in hand on 4/16.