life-dinner principle

Etymology
and, in reference to one of Aesop's fables (see the quotation below).

Noun

 * 1)  A principle of asymmetry in selective pressure between predators and prey.
 * 2) * 1992, Heather Joanne Henter, The ecological genetics of interactions between the pea aphid and the parasitoid Aphidius ervi. PhD dissertation. Cornell University. page 8:
 * Dawkins and Krebs (1979) have suggested that, unless predators are rare (Dawkins, 1982), prey should evolve more quickly than their predators due to stronger selection on the prey. This has been termed the “life-dinner” principle
 * Dawkins and Krebs (1979) have suggested that, unless predators are rare (Dawkins, 1982), prey should evolve more quickly than their predators due to stronger selection on the prey. This has been termed the “life-dinner” principle