The yellow warbler species is found all the way from North America to Peru. In the Galapagos, studies have shown slight differences in the species based on each island.
Yellow warblers are monogamous species. Males and females are distinguished by the colors in the chest. Males have red streaks and the female either lacks them or they have a pale color. Females are the ones who build and take care of the nest mostly, while males are in charge of bringing food and protecting the nest territory. In the Galapagos Islands, they lay from 2 to 5 eggs that in occasions can take about 100 days to hatch. Usually, not all of them survive.
This bird has a very wide range of singing melodies that are pleasant to the ear and it is easy to distinguish from other birds.