bluebird

n.

北美洲产的蓝知更鸟；

复数：bluebirds

1. That is a beautiful bluebird.
   那是一只美丽的知更鸟。

Eastern Bluebird (Sialia sialis)
Western Bluebird (Sialia mexicana)
Biology of the Mountain Bluebird in Montana
Nesting Habits of the Western Bluebird
Eastern Bluebird Responses to Nocturnal Black Rat Snake Nest Predation
Fitness consequences of helping behavior in the western bluebird
The Establishment and Maintenance of a Bluebird Nest-Box Project. A Review and Commentary
Occurrence and demography of mites in tree swallow, house wren and eastern bluebird nests
Replacement Males in the Western Bluebird: Opportunity for Paternity, Chick-Feeding Rules, and Fitness Consequences of Male Parental...
Variable Effects of Yolk Androgens on Growth, Survival, and Immunity in Eastern Bluebird Nestlings