Do siblings guinea pigs eat each other?

In the wild, guinea pigs do kill other guinea pigs. The reason is usually because two males are arguing over a female. The males both want the female so they have a fight to the death. The winner (the one that is alive in the end) gets the female. This could happen in your home if you have males and females in the same cage. The chances of that are very, very small. Males also just fight for dominance. My two males often fight when i put them together, but when in separate cages they talk to each other and act as best friends. If you wish to put two males together, purchase them when they are both young and emidately join them in a single cage. You can also buy two males that were in the same cage at the place you purchased them from. So that sums up that guinea pigs do kill their own kind, but usually the males are the ones killing (and dont forget this is rare at your home and can be very easily be avoided).