What does a diamondback rattlesnake eat?

it eats mice

Rattlesnakes consume mice, rats, smaller squirrels, lizards, small birds and other small animals.

Rattlesnake are Carnivores. They consume Mice, Rats, Small Birds and other small rodents that inhabit the habitats they live in. They play an important ecological role by limiting the size of rodent populations in their ecosystems. Rattlesnakes lay motionless for their prey and kill it quickly with a venomous bite. Even if the prey is lucky enough to run off, it will die soon and the Rattlesnake will follow the scent and then swallow it. They are on top of their food chain, but they have some animals like the King Snake on top of it.