"Crustacean": {
      "Types": [
        "Hermit Crab",
        "Giant Isopod",
        "Giant Crab"
      ],
      "Buildings": [
        "Coop",
        "Big Coop",
        "Deluxe Coop"
      ],
      "AnimalShop": {
        "Name": "Crustacean",
        "Description": "Crustaceans prey on small ocean life",
        "Price": "6000",
        "Icon": "assets\\animal_shop_crab.png"
      }
    },


Here is what needs to be copy-pasted into BFAV's config.json. You also need to copy animal_shop_crab.png into the BFAV's assets folder.