adult; no sexual dimorphism; bluish crown (California, USA; 2011-04-10)

Tree Swallow
Tachycineta bicolor

Native Range: North America

Notes: this common swallow is bright blue above (in good light) and snowy white below; nests in tree cavities, cliff holes, or nest boxes, and typically lines its cup-like stick nest with large feathers.

snowy-white underparts (California, USA; 2006-05-07)

steel-blue upperparts (California, USA; 2007-06-17)

blue upperparts show best in good light (California, USA; 2007-06-17)

slightly forked tail (California, USA; 2007-03-03)

feeding young in nestbox (California, USA; 2007-05-19)

stick nest lined with feathers inside nestbox (California, USA; 2006-04-15)

juvenile; brown above, brown breast band (California, USA; 2009-07-04)

juvenile could be confused with Bank Swallow (California, USA; 2007-05-28)