I was wondering where is the best place to apply ivermectin pour on? I have heard on the back of their necks and where there wings start. Where is it most affective? Also, how does it work? It doesnt seem like a little bit of ivermectin can worm and kill any parasites. Does the bird absorb it? If I had a lice infestation, should I re apply ivermectin in 10 days?