setophaga aestiva Archives - Retired in Costa Rica

December 5, 2025December 1, 2025

Welcome Migrant! The Yellow Warbler

Is back in Costa Rica from “up north” and no longer called just “Yellow Warbler” as in the past but has a new official name of Northern Yellow Warbler – Setophaga aestiva (linked to my gallery) and what is used by eBird and iNaturalist. Some older books still say just Yellow Warbler and the Princeton Field Guide says American Yellow Warbler. I’m not sure which names are harder to keep up with, Birds or Butterflies! 🙂 They seem to both be changing frequently. This particular bird showed up on December 1 in my Cecropia Tree. Here’s two shots of him/her . . .

January 22, 2025January 13, 2025

Yellow Warbler

I used to see a lot more of these but that was back when I saw a lot more of all birds than now. It is the Yellow Warbler, Setophaga petechia (eBird link) which is found in all of the lowlands of Costa Rica but be aware that some books are now separating the American Yellow Warbler (Setophaga aestiva) and the Mangrove Warbler (Setophaga petechia) which is the one that is a resident of Costa Rica while the American are migrants from the north and also here. The Mangrove Warbler is best known to birders as the one whose male has a chestnut red head. The females seem to be identical. You can see both in my Gallery of Yellow Warblers. And eBird has kept them together as I do in my gallery. Here’s 3 shots from my garden . . .

December 13, 2023December 12, 2023

Yellow Warbler

She was in the early morning shadows at breakfast on my terrace, thus poor photos, but I had to share since it’s the first Yellow Warbler I’ve gotten in a long time, maybe this year, though usually more common. There can be both local residents and migrants from the north, with this one being an adult female, meaning I can’t tell since both local and migrant females are the same, while males are different with the male in CR having a rusty-red head. There is also a CR Mangrove Warbler that is almost identical, but it only lives in the Mangroves along the coast, thus never here in Atenas in the Central Valley, while the Prothonotary Warbler can be in both locations but is a little more distinct or never confused with this one.