Kasugai Crows

Kasugai Crows are crows that are used by the Demon Slayer Corps, primarily for communication. Each of them is assigned to a Demon Slayer Corps member. They deliver missions to their designated members.

Description
These crows are special in that they can speak in full sentences, though their speech is very loud and limited. Most generally look and speak similarly, exceptions being Muichiro Tokito's crow, who has feminine eyelashes and can speak normally most of the time, and Zenitsu Agatsuma's Kasugai Crow, Ukogi, who is actually a sparrow instead of a crow and can't actually talk.

Trivia

 * Each crow has 2 names: one childhood name given to them by the current Oyakata-sama, and one they later receive from the Corps member they're assigned to when that time comes.
 * If the Corps member that the crow was assigned to dies, the crows might be assigned to another member. If such a thing happens, the name given by the former member is respected.
 * Some crows like to go by the name given to them by the Oyakata-sama while some, such as Tanjiro's crow, opt to give themselves their own name.
 * After the battle against Muzan, the crows were allowed to live freely, though sometimes they would come to visit the Ubuyashiki estate as well as the surviving Corps members they were assigned to.
 * After the battle against Muzan, Ginko (Muichiro's crow) became weak and sickly. She was comforted by Matsuemon (Tanjiro's crow) and both crows eventually got married.