Spiders and other predatory insects also consume darkling beetles when given the chance. What do mealworm beetles eat? read more. These beetles aren't designed for combat, but they do have one trick up their sleeve. Related Questions. While there’s a lot of truth in that, when they mature and turn into beetles they are suddenly very mobile. If you are thinking of raising mealworm beetles you can buy mealworm food from many pet stores. Mealworm beetles eat pretty much the same as mealworms. meal worm beetles eat apples, celery, potatoes, carrots, and oats. When disturbed, some darkling beetles assume a defensive posture where they stand on their head and release chemicals from scent glands in their rear-end that … Asked in Garden Insects, Beetles, Care of Insects Mealworms are the brown worm-like larvae of darkling beetles. In this form they have the potential to do … Looking at a box of mealworms it’s hard to imagine that they could do anything more than sit in one spot and eat whatever is given to them. They like potatoes, sweet potatoes, dried bread, apples, and a whole bunch of other stuff. 0 0. Source: quora.com. Predators of mealworms and darkling beetles are birds, rodents, lizards, predatory beetles and spiders. Mealworms can be found throughout most of … Many types of birds, lizards and rodents eat them regularly. Wiki User April 25, 2011 4:03PM. Since darkling beetles are so widespread and numerous, they make a great source of food for various animals. They are the second of four stages of life and exist to eat and grow until they have enough energy stored to begin transformation into pupae and then beetles.