Two species of micro organism seem to reverse which is predator and which is prey relying on the temperature. Only a small temperature change is sufficient to trigger the swap.

The soil micro organism Myxococcus xanthus is a social species that hunts in packs – it types momentary, multicellular “swarms” of people that chemically tear aside and take in vitamins from different microbes. And its prey consists of Pseudomonas fluorescens, a bacterium frequent in each soil and water.…