vesper bat; Asian particolored bat; evening bat
Refers to bats of the family Vespertilionidae, especially Vespertilio sinensis. In everyday Japanese, it is often used as a general term for small bats.
The vesper bat flies around hunting for food in the evening.
Vesper bats are often seen in this area.
こうもり is the general word for 'bat', while ヒナコウモリ specifically refers to vesper bats or the Asian particolored bat.
Asian particolored bat
The katakana spelling is the most common and recommended form; the word is usually written in kana.
Kanji form using 雛 (chick) and 蝙蝠 (bat); rarely used in practice.
Alternate kanji form using 鄙 (rural); even less common.
The name likely derives from ひな (small, chick) and こうもり (bat), referring to a small species of bat. The exact origin is uncertain.