noun
Eurasian nuthatch
A small woodland bird (Sitta europaea) known for climbing down tree trunks headfirst. The name is usually written in katakana.
公園でゴジュウカラが木の幹を逆さまに降りているのを見た。
I saw a Eurasian nuthatch climbing down a tree trunk upside down in the park.
The name 五十雀 (literally 'fifty sparrow') is of uncertain origin; it may refer to the bird's call or an old counting word. The reading ごじゅうから is a kun'yomi compound.