Natural selection is nothing to do with what happens every time a predator takes its prey. I once watched an amazingly-fit wood pigeon brought down by a pair of peregrines. The pigeon's only problem was that it was unsuspecting. Even James Bond might have been killed for that reason alone. A common misconception that leads us up shit creek sans paddle. Natural selection is the non-random survival of genes in a gene pool, survival being the operative term, and genes being the appropriate hierarchical level to discuss. Darwin might have called them heritable factors.