* Predation: Some venomous snakes, such as the eastern diamondback rattlesnake, are known to prey on possums. Possums are relatively small and slow-moving, making them easy prey for snakes.
* Self-defense: If a possum feels threatened by a venomous snake, it may try to defend itself by biting or scratching the snake. This could cause the snake to retaliate by biting the possum in self-defense.
* Competition for resources: Possums and venomous snakes may compete for the same resources, such as food and shelter. If a snake feels that its territory is being threatened by a possum, it may kill the possum in order to protect its territory.
It is important to note that not all venomous snakes will kill possums. Some snakes, such as the copperhead, are not typically aggressive towards possums. However, it is always best to err on the side of caution and avoid contact with any venomous snake.