It depends on what species of viper you're talking about.
Vipers generally subsist on small mammals and birds, but other reptiles have been utilized as food items also. As to the specific quantities or percentages of different prey items in the vipers diet, this will depend on the specific biotope they're native to. Vipers are fairly widespread, and have adapted to deserts, temperate zones, arboreal life, etc.
Fish
At least 20% of your diet should consist of fats.
whats douse the snow leopards dite consist
Polyphemus diet consists of Polyphemus ate odysseus
mojo fail
Flesh and bone.
humans
No gluten
Carbohydrates are non-essential and therefore the diet shouldn't consist of any specific amount.
dead shellfish
jizz......
the Samiries diet consists of fish, rice, veggies and plenty of cardio