We would probably be incredulous to know just how many acorns are wedged in the cracks and fissures of this tree. The birds - and there are several provisioning these granary trees - work all day every day stuffing acorns, and they've been at it all fall. This hidden bounty will make for easy meals after winter sets in and the going gets rougher. Also, as the trees are in water, they are probably protected against mammalian theft at the paws of squirrels and other potential pilferers.
The red-heads best hope that Rusty Blackbirds don't evolve such thieving habits to a fine degree and become the jaegers of the blackbird world, plundering granaries far and wide.