Vipers eat a variety of food depending on the size of the snake. Prey includes small mammals, birds, lizards and eggs, according to Savitzky. When their prey is dead, they swallow it whole.[1]
How Does The Gaboon Viper Hunt?
Primarily nocturnal, Gaboon vipers have a reputation for being slow-moving and placid. They usually hunt by ambush, often spending long periods motionless, waiting for suitable prey to pass by, though they have been known to hunt actively, mostly during the first six hours of the night.[2]
Resources
[1]https://www.livescience.com/54023-vipers.html
[2]https://en.wikipedia.org/wiki/Gaboon_viper