willingham woods creature sighting

my husband and myself were camping in willingham woods, as we are keen bird watchers,  on the first night everything was fine, on the second night we were startled by a loud screech/howl  not a noise we have heard before, i asked my husband what bird it was but he had no idea, we left the tent as it was about 3am it was very quiet and still, off to my left about eye to eye with myself i saw greenish eye shine,  that settled us as it was dark and my husband explained it was probably just an owl, at that point the owl stood up to about 7ft and started to "walk" off away from us.  we packed up at 6am and will not be re-turning