The warbler itself is 14 cm long, with a rich yellow body and dark blue-gray wings and tail. Their coloring is a little richer than a gold finch. Like the gold finch, the female is not colored so loudly.
You can find these birds nesting in old woodpecker holes and any other cavities available in wooded swamps and riverbanks. Nests are close to the water, and rumor has it the young can swim.