Ruby-crowned Kinglet Regulus calendula Linnaeus       Field Guide IDs: NG-338 G-252; PE 2l6; PW-pl 49; AE pl 459; AW-pl 510; AM(III)-36 Nest Location Nest Type Eggs & Mating System Dev. & Parental Care Primary & 2ndary Diet.. Foraging Strategy MF I: 12? DAYS ALTRICIAL 15 feet - 30 feet (2 feet - 100 feet) F? 7-9 (5-11) MONOG F: 12? DAYS MF TREE SAP BERRIES HOVER & GLEAN HAWKS BREEDING: Coniferous and coniferous-deciduous forests. ? broods. DISPLAYS: Male displays with red crest erect, singing a "wheezy, subdued song." NEST: Hung from limb, open at top with cavity deep enough to conceal incubating bird; of moss, lichen, down, twigs, dead leaves, lined with fine materials. EGGS: Creamy white to muddy cream, variably spotted with brown, usu wreathed. 0.5" (14 mm). DIET: Includes spiders; few seeds. CONSERVATION: Winters s to w Guatemala. Rare cowbird host. NOTES: Winter studies suggest that size of N.A. breeding populations may be limited by conditions experienced during the winter. Forms loose, mixed-species winter flocks with titmice, nuthatches, Brown Creepers, Golden-crowned Kinglets, and warblers. STANFORD. NOTES: Fairly common migrant and winter resident in various habitats throughout campus. ESSAYS: Bird Guilds; Mixed-Species Flocking; Population Dynamics. REFERENCES: Laurenzi et al., 1982.