I am pretty sure we have a lice (louse?) problem...One of my girls (Buffy) has chewed up looking feathers. I suspected lice and dusted everyone with permethrin, then again 10 days later. The second dusting was Sunday. I just noticed this morning that Buffy has an area on her neck where they are really chewed, this looks new to me. I don't know that I dusted her neck very well, I know that I got her vent and body. I'm wondering if they retreated to the neck - I now know this is where they like to hang out anyway. My question is this, I'd like to try ivermectin instead, I really really hate dusting them, and they hate it too. Is this: http://www.amazon.com/Durvet-Ivermectin-Pour-On-250ML/dp/B000HHOEIU/ref=sr_1_7?ie=UTF8&s=hi&qid=1305218206&sr=8-7 the same as Ivomec Pour on? It's significantly cheaper. $15 + shipping vs. $32 + shipping. I'm blaming this on the darn starlings!