Ruby-crowned kinglet (male)
Regulus calendula

Size: 4.25 inches
Overall Color: grayish green
Occurrence: washes
Diet: insects, spiders, fruits, seeds, sap
Nest: hanging cup
Field Identification: concealed red patch on head, white eye ring, white wing bars, hyperactive
Season: winter

Kingdom: Animalia (Animals)
Phylum: Chordata (hollow nerve cord)
Subphylum: Vertebrata (backbone)
Class: Aves (Birds)
Order: Passeriformes
Family: 64 Regulidae (kinglets)
Genus: Regulus
Species: calendula