After the Nachash manipulated Chava into eating from the Eitz Hadaas, it received a punishment- it would eat dust from then on, and being that dust is rather plentiful, it would not have anything to daven to Hashem about.
I’ve learnt this piece of information every year in school, since I was about 6, yet it somehow took me until just now to realize that snakes do not, in fact, eat only dust. They eat other organisms…