Many moons ago I had a multiple strike in an absolute max weight Victor tanker on rotate during a dawn take off at Marham. All four Saphires were damaged. Fortunately in those days the straight through engines were more tolerant of misuse and I was able to get it back in one piece. Apparently well over 100 gulls (which had reroosted on the warm concrete following bird scaring and a previous take off) were killed and the braking action was degraded by bird corpses. We got the job done though in a spare aircraft and did the paperwork when we got back a day or so later.