Whether it's de-icing or birds, some seem to have such short memories when there is so much to learn from the past.
NBDC - Summary of the Hercules Crash
(Belgian A.F. C.130 accident)
One large bird or a flock of small birds can prove fatal to aircraft.
Starlings are virtually impossible to move off an airfield if they choose to stick around - you'll only move them around it.