If there are no buzzards in Avebury it's due to lack of local perches, not because it's beyond their distribution area. I've always been obsessed with them and I've seen them extend westwards a few miles at a time throughout my life. I saw one in Lincs this year.

About Z stone alignment. Does the obelisk come into this? Because, I understand, the concrete marker is misplaced. Pete will tell all no doubt.