white-cheeked starling; grey starling
Refers specifically to the species Sturnus cineraceus, a common bird in East Asia.
I saw a flock of white-cheeked starlings in the park.
starling (any bird of family Sturnidae)
Broader taxonomic use; in everyday contexts, ムクドリ usually means the white-cheeked starling.
Birds of the starling family are distributed worldwide.
bumpkin; gullible person
Slang or colloquial use, likening a naive or easily fooled person to a starling. Rare and somewhat dated.
That guy gets fooled easily, just like a bumpkin.
Slang; from the visual resemblance of two birds facing opposite directions. Vulgar and not for polite conversation.
They tried the sixty-nine position.
grackle; crow blackbird; oriole (in some contexts)
Katakana spelling is standard for this bird name; the word is usually written in kana.
Kanji spelling is rare and mainly encountered in older texts or specialized contexts.
The name ムクドリ is of native Japanese origin. The kanji 椋 (muku) refers to the Chinese cork tree, and 鳥 (tori/dori) means bird, but the exact derivation is uncertain. The slang senses derive from the bird's perceived characteristics or appearance.