If you don’t buy them from very traditional read very expensive producers it is also very unnatural. Animals are simply used as self replacing bio reactors that are fed the cheapest inputs like grain and animal remains. Even the vitamin d in milk is mostly there because you just supplement the animals. I visit a small farm on vacation a few times a year and they have a bunch of chicken running around. I have no qualms eating their eggs, they are not even slaughtered in most cases as the fox eats them first. They also have a dozen cows on their meadow. But let’s not pretend that is where most animal products come from.