The American yellow warbler feeds mainly on insects, such as caterpillars, beetles, flies, and spiders. It also eats some fruits, berries, seeds, and nectar. It forages in flocks, often hanging upside down from the branches to reach the food. It is a very vocal bird, with a sweet and whistled song that sounds like “sweet sweet sweet, I’m so sweet”. It also has a distinctive call, sounding like “tswit-tswit” or “ti-ti-ti”.

The American yellow warbler breeds from April to July, depending on the region. It builds a cup-shaped nest in a tree or a shrub, using grass, moss, lichen, and feathers. It lays four to six eggs, which are pale blue with reddish-brown spots. The female incubates the eggs for about 12 days, while the male feeds her. The chicks are fed by both parents, and fledge after about 15 days. The American yellow warbler is often parasitized by the brown-headed cowbird, which lays its eggs in the warbler’s nest. The warbler may reject the cowbird’s eggs, or build a new nest on top of the old one.

The American yellow warbler is a popular and symbolic bird in many cultures. It is often depicted in art and literature, as a sign of joy and happiness. It is also associated with the legend of St. Francis of Assisi, who is said to have removed a thorn from a goldfinch’s head, causing it to bleed and stain its face red.

The American yellow warbler is a remarkable bird that deserves our attention and admiration. It is a symbol of nature’s diversity and beauty, and a source of inspiration and joy for many people. We hope that this article has given you some interesting information and insights about this amazing bird.