What is the most poisonous desert animal?

I know of no desert animals that are poisonous - that kill or injure someone or something that eats them except for a few toads that live in the desert that are poisonous to eat. There are a number of desert animals that are venomous. These kill by injecting a toxin. The most dangerous snake found in deserts of the Middle East is the saw-scaled viper (Echis carinatus) .