**Description:** A bright yellow warbler with black "moustache" marks and distinct black streaking along its sides.
**Size & Weight:** 4.3–5.1 inches long. Weighs roughly 0.3 oz.
**Sexual Dimorphism:** Males are more vibrantly colored with heavier black streaking than females.
**Behavior:** Known for a constant tail-wagging habit and a rising, buzzy song that sounds like a tiny mechanical zipper.
**Habitat:** Specialist of young forest and plateau scrublands; found in recent clearcuts and regenerating fields.