One shouldn't need to use statistics or years - long research to see how quickly the numbers of dead prey add up. (outthefrontdoor.com)
For this reason, as well as humane concerns for live prey, it is strongly suggested that you train your snake to eat dead prey. (brittonroadveterinaryclinic.com)
And try not to leave toys laying around — to a cat, a toy on the floor just looks like dead prey. (fixnation.org)