Children (16 direct children, 45 direct and indirect children):
Goldcrest
(tree size 15)
Regulus regulus
Common firecrest
(tree size 5)
Firecrest
Ruby-crowned kinglet
(tree size 3)
Regulus calendula
Flamecrest
Regulus goodfellowi
Golden-crowned kinglet
(tree size 5)
Regulus satrapa
Tenerife goldcrest
Regulus teneriffae
Madeira firecrest
Madeiran kinglet
Regulus bulgaricus
Regulus cristatus
(tree size 1)
Regulus callendula
Regulus flaveolus
Regulus himalayensis
Regulus madierensis
Regulus yunnanensis
Regulus ignicapillus
Regulus inornatus