No matter what part of the world you come from, if you travel much in Cambodia, you are going to encounter food that is unusual, strange, maybe even immoral, or just plain weird. The fiercely omnivorous Cambodians find nothing strange in eating insects, algae, offal or fish bladders. They will dine on a duck foetus, brew up some brains or snack on some spiders. They will peel live frogs to grill on a barbecue or down the wine infused with cobra to increase their virility.
To the Khmers there is nothing 'strange' about anything that will sustain the body. To them a food is either wholesome or it isn't; it's nutritious or it isn't; it tastes good or it doesn't. And that's all they worry about. They'll try anything once, even a burger.
Avoid eating endangered species, otherwise they will soon be extinct species.