She had her trusty Sibley Field Guide, the go-to-manual for many "twitchers" who want to be sure they're not mistaking a golden-crowned kinglet for a ruby-crowned kinglet.
What does RCKI stand for?
RCKI stands for Ruby-Crowned Kinglet (Regulus calendula bird species)
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Samples in periodicals archive:
In descending order, these were dark-eyed junco (Junco hyemalis), pygmy nuthatch (Sitta pygmaea), western bluebird (Sialia mexicana), white-breasted nuthatch (Sitta carolinensis), mountain chickadee (Poecile gambeli), ruby-crowned kinglet (Regulus calendula), Steller's jay (Cyanocitta stelleri), hairy woodpecker (Picoides villosus), and brown creeper (Certhia americana).
She said one year she recorded a ruby-crowned kinglet.
Burdock entrapment of a ruby-crowned kinglet in the Creston Valley.