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Common firecrest
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=== Fossils === There are a few [[Pleistocene]] (2.6 million to 12,000 years ago) records from Europe and Israel of extant ''Regulus'' species, mostly goldcrests or unidentifiable to species, but also a Spanish specimen of firecrest. A left [[ulna]] from Bulgaria was identified as belonging to a fossil species, ''[[Regulus bulgaricus]]'', from 2.6–1.95 [[mya (unit)|mya]]. This appears to be ancestral to the common firecrest, with the goldcrest diverging from this lineage in the Middle Pleistocene.<ref name=Boev>{{cite journal|last=Boev |first=Zlatozar |year=1999 |title=''Regulus bulgaricus'' sp. n. β the first fossil Kinglet (Aves: Sylviidae) from the Late Pliocene of Varshets, Western Bulgaria |journal=Historia Naturalis Bulgarica |volume=10 |url=https://www.biodiversitylibrary.org/page/31093140#page/111/mode/1up |pages=109β115}}</ref>
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