Folks, we're not talking about how the strong can abuse the weak.
This is known, just as it is known that the violent can murder the pacifistic, and the sneaky can steal from the careless. That doesn't make these things right, nor does simple might make right.
Natural rights is about what rights human beings ought to have and which ought to be respected by all because our very nature, needs and drives make them important.
The right to life: Humans, like all other living things, strive to continue to exist. Since that's something virtually all of us want and need, it is something we should respect for others so they will return that respect to us. A human life should not be taken without very compelling reason.
As all living things defend themselves as best they are able from attack, so do humans... thus the right to self-defense against unjust attack ought to be considered a natural right, as is the common means to that defense.
No sane person wants their body violated by unwanted forceful sexual acts perpetrated on their person, so again this should be respected as a natural right.
The right to property can get a bit more complex and nuanced, but it is not too much of a stretch to say that where a person has plowed and planted, they should have a right to reap and keep the produce of their labor. The details can be hashed out, but the general principle is there even in primitive cultures... if I made the bow, it is my bow unless I give or trade it to another.
Some people try to make out that it isn't a "natural right" if it can be taken away. BS. Natural rights are not scientific laws, but rather a recognition that the very nature of humanity implies that certain rights of each person ought to be respected and not infringed upon... particularly the Big Three, Life Liberty and Pursuit of happiness, from which the others derive.