Drinking regular milk will not only give kittens diarrhea, but will also cause them to slowly starve to death if their diet isn't properly supplemented [source: Kitten Rescue]. The ratio of caseins and whey in cow's milk is nowhere near sufficient to support a growing kitten [source: Fries].
One of the significant adaptions occurred in one strain of E. coli. In general, this bacteria is known for not being able to use citrate in an aerobic environment as an energy source, even though it could use citrate under anaerobic conditions because it already has the machinery to process citrate.
Escherichia coli (E. coli) , a rod-shaped member of the coliform group, can be distinguished from most other coliforms by its ability to ferment lactose at 44Â°C in the fecal coliform test, and by its growth and color reaction on certain types of culture media.