Figure 15 in Are some of the birds endemic to the Tres Marías Islands (Mexico) species?

Figure 15. Back patern, size and intensity of orange in Streak-backed Oriole Icterus pustulatus specimens from Nayarit, from left to right: two typical microstictus / yaegeri, two presumed hybrids (with Phillips' specimen at right) and a typical graysoni; note the similar overall size of graysoni and Phillips' specimen, which is, however, more orange overall (especially the head), while the other presumed hybrid (which appears almost as long due to specimen preparation) has back streaks intermediate between graysoni and typical mainland Nayarit orioles (Héctor Gómez de Silva)