caption: The image shows a small mammillaria cactus in the middle of a field, surrounded by grass and other plants. The cactus has spines and a cylindrical shape, with a reddish-brown body and a yellowish-green stem. Its leaves are a mix of green and yellow, and its spines are sharp and pointed. The grass is a vibrant green, and the other plants are a variety of colors, including yellow, orange, and red.