Believed by some to be very similar to the ancestral species of the Darwin's finches, and one of the best examples of ecological release. According to E. O. Wilson, "The birds, all members of a single freely breeding species, occupy niches ordinarily divided among species, genera, and even entire families of birds". Individuals specialize in one type of food for several weeks to an entire lifetime. Feeds variously on insects, spiders, mollusks, small lizards, seeds, fruit, and nectar. "Young birds appear to prosper with personalized instruction".