while at least 56 species of honeycreeper are known to have existed, all but 18 are now extinct. some honeycreepers eat seeds, some eat fruit, some eat snails, and some eat nectar. their bills vary from parrot-like to straight and thin. the large distances between different islands allowed for a high level of isolation, increasing the diversification of the separated groups of honeycreepers. what type of geneticist would study the speciation of hawaiian honeycreepers?