Jo Ann, I am getting ready to plants some new semps. I will cover them with more of the nursery trays. The ones I planted a month ago have mostly rooted in well enough to uncover.
The jays move the semps around for one of two reasons... They buried a nut or other food item close to it (even under it) and they have come back to retrieve it, or they are using the semp (presumable small one) to cover a place nearby where they have buried a nut (food). They are very smart birds. If they think another jay has observed their cache they will dig it up and move it to another place.
Signed, Connie who spent a good year or so closely watching these birds.
Oh yes! One day at the periphery of my vision near a window, I saw a Blue Jay tackling a long piece of something and then jumping away from it. At first I thought he was trying to break a long piece of straw or trying to fly away with it. I saw the Jay banging against the fence and was wondering what was getting the best of him. I stepped closer to the window and saw the very long tail of a lizard in the Blue Jay's mouth. Apparently, the Jay was trying to wrangle the lizard into some sort of submission? Obviously the lizard was too big for him but maybe the family was watching and he had to show the lizard who was boss despite the bruises he must have gotten from banging into the fence...
I guess if the lizard was very big it got away... Are your jays the Stellar type (blue with dark head and top notch) or Scrub Jays which are blue and gray (no top notch)?