Bird Kabobs are made of yucca which comes from a shrub in the Asparagaceae family of plants. This is the same family of plant that the familiar asparagus comes from (as well as about 2500 other plants). Although the plant looks a bit like a cactus, it is not a cactus. The best way to give your bird yucca is with the safe and sterilized Bird Kabob range of products.