A blue jay picking on a wasp nest

As we went out, we noticed a blue jay in the maple tree in front of our house. It was hammering on something, and it took us a bit to realize that it was in fact picking on a wasp nest, no less! My mother had been wondering where those wasps came from - we had infestations below the front porch, and even once, between the ceiling and 2nd floor right under my father's bedside table (where they indeed did quite some damage, leaving a mark on the wood, which we saw firsthand last year, as we were renovating).