Bumpus’ Sparrows (1898). Herman Bumpus was a zoologist at Brown University. During the winter of 1898, by accident he carried out one of the only field experiments in natural selection. One cold morning, finding 136 stunned house sparrows on the ground, he tried to nurse them back to health. Of the total, 72 revived and 64 died. He weighed and carefully measured all of them, and found that those closest to the average survived best. This frequently quoted research study is another evidence that the animal or plant closest to the original species is the most hardy. Sub-species variations will not be as hardy, and evolution entirely across species (if the DNA code would permit it) would therefore be too weakened to survive. (*R. Milner, Encyclopedia of Evolution, 1990, p. 61).

In 1900, three scientists independently discovered Gregor Mendel’s astounding research findings about heredity. In the years since then, genetic research has repeatedly confirmed that there are only changes within species—never cross-species changes (which would be true evolution). This is true of plants, animals, and even microbes.

Source: Evolution Handbook