ムジルリツグミ Sialia currucoides

Adult males are stunning: completely electric turquoise blue with limited white belly. Females are gray with blue wings and tail; some can show a rufous wash on breast. Also note thin bill and even longer wings compared with other bluebirds. Forages in open habitats with few trees. Can form large flocks in winter. Frequently perches on wires or fence posts. Nests in cavities.