I'm not sure about the possum but the mongoose actually eats spitting cobras and other types of snake. The reason why the cobras venom doesn't affect the mongoose is because it has long and thick fur so that the venom stays on top of the skin and doesn't seep into the blood stream.
a mongoose eats a king cobra so the cobra is the mongoose's prey.
Spitting cobras are a type of snake. Like all snakes, they are carnivorous. A spitting cobra's prey includes small animals such as rodents.
Spitting Cobras are well known for their ability to spit venom at their predators and prey.
The Mongoose and the Honey Badger, and some raptors (by that I mean birds of prey). And as always, man.
Prey: Other snakes and rodents Predators: Vultures, eagles, humans, and the mongoose
The king cobra's only notable predator is the mongoose, which can hunt king cobras due to its immunity to the cobras neurotoxin. However, the king cobra's defense tactic of extending its hood, standing, and hissing a low hiss is usually successful in intimidating an attacking mongoose into leaving it alone, coupled with the fact that most of the mongoose's other prey is much easier to kill than a cobra.
There are several species of spitting cobras, the King Cobra is not one of them. Black-Necked Spitting Cobra Black Spitting Cobra Western Barred Spitting Cobra Red Spitting Cobra Mozambique Spitting Cobra Malaysian Spitting Cobra Black and White Spitting Cobra Sumatran Spitting Cobra Nubian Spitting Cobra
While I don't honestly know too much about spitting cobras, I do know a fair bit about snakes in general and that when they spit/ hiss/ flatten their frill they are defending themselves so presumably they hunt like all other snakes; by sniffing and smelling their prey then poisoning it through their fangs.
a small animal that it wants to kill or eat
A mongoose has many prey's such as road runners, bunnies, and more. There is a particular animal or should I say reptile that is a mongoose prey that is a strong snake... a king cobra.
prey
Generally a Cobra is a predator. However, they are preyed on by rare specialist predators like Mongoose and Alpha predators like Honey Badgers.