Does it really matter knowing about the name #hummingbird for a pick in SERPs fluctuations after one month? Moreover if you were already follow fluctuations on SERPs and comparing these with your websites ranks and testing? And what this change really? I am anyway waiting for some useful tips and test from the SEOs online (in example from Searchengineland, and some debate on line) on Hummingbird, that would be really useful. Here my humble opinion