ruby-crowned kinglet

The ruby-crowned kinglet (Regulus calendula) is a small songbird found in North America, belonging to the kinglet family Regulidae. These birds are among the smallest songbirds, weighing less than 10 grams, yet they are remarkably active and can survive in cold climates. They typically inhabit coniferous woodlands and build small nests from moss and cobwebs, often holding 5 to 10 eggs.12

The ruby-crowned kinglet is characterized by its greenish-gray plumage and a crown patch. While other kinglets have yellow or red crown patches bordered with black, the ruby-crowned kinglet's crown mark is a small, usually concealed, red patch visible only on the male. This species is also noted for its notable song.12