One of those looks like Furhead Wheel-Chock.
Nice deck ! Cats can get under it easily.
Furhead Wheel-Chock has apparently traveled the world....
I am a firm believer in "open under decks" in the country. We have an enclosed deck on the pond side of the house and it has always attracted critters who dig a tunnel and figure they have a wonderful new home. Wasps and hornets really like it too.
