Can a fox- bird - snake- rat- cactus- sun be a food chain in that order, if any suggestions please comment?

It's sort of OK, except we always start with the producer and go from there, so list your energy flow the other way round, i.e. Sun -> cactus -> rat-> snake-> bird -> fox. If you can name a bird that eats the snake and the snake that eats the rat it would be better, and make sure the bird that eats the snake is also one that gets eaten by foxes. Is this just a hypothetical food chain, or does it have to be accurate, as I wonder if rats really do eat cacti? Also it is highly unlikely that birds that eat snakes would be preyed upon by foxes as these birds are high up a food chain they are likely to be birds of prey, and are not predated upon by anything.