Here we have a newly-arrived male Northern Parula Warbler busily gleaning insects from emerging Speckled Alder leaves.
The female NPW looks the same, except she’s neater and doesn’t have dark “food stains” on her chest. Compare her with him:
James Audubon named these little birds “Blue Yellow-Backed Warblers” because that’s what they look like:.
However, our ornithological high priests who prefer obscure terminology baptized them Parulas (“little titmice,” the genus for titmice being Parus).
Our Parulas are called Northern because they live mostly in the United States and Canada, compared to the Tropical Parulas, which are yellower and live mostly in Central and South America. (Brooklin, Maine)