The arms race concept completes the classical supernormal stimulus explanation, by providing a functional account of the host’s maladaptive behaviour, instead of leaving it as an unexplained limitation of the nervous system.
Sum: how arms race combined with rare enemy principle can explain the maladaptive behaviors of organisms - exemplified by cuckoo parasitising other birds' nests. The stimulus provided by the parasite is termed 'super-normal stimuli'
