Several weeks ago I read an article about taking wildlife pictures. One section of this article was about blinds for getting in closer to your subject. Where ever possible the author stated try to use the blind you already own and the one that the birds and wildlife are already used to... Your car (or truck in my case).
So today I tried it... I stoped the truck beside the road where there were quite a number of birds in some bushes. Sure enough they all flew away.