How to build a food chain in the desert?

You can make, for example, such a food chain for a given area: beetle – spider – centipede – scorpion – lizard – monitor lizard. At the head of this food chain is the monitor lizard. This is such a very large lizard. Some species of these animals can reach three meters in length. Their tongue is quite large, and these animals also have large eyes. It should also be said that these animals have quite good aerobic abilities. These animals are one hundred percent predators.