A few years ago I was hand pollinating different color variants of Iris fulva. Being a dwarf-ish species, I was crouched down near the ground. Suddenly there was a loud, deep buzzing noise behind my head. How big was this bee?!?!? I was scared to look, but I sure ran away from those flowers fast! Lo & behold it was a ruby-throated humming bird... apparently annoyed that I was messing with his flowers! Okay, so that wasn't about Lilium, but it was my favorite humming bird encounter. :-) Dennis in Cincinnati