Coral no Tanken
English name: Coral Investigates
Genres: Adventure
Type: TV, Episodes: 50
Aired: Apr 7, 1979 to Mar 29, 1980
Source: Other
Rating: G - All Ages
Synopsis:
Hector the Rat teams up with his fellow denizens of Pretty Wood, including the titular Coral (a young girl) and the unimaginatively named Crow (a crow), to head off to Holland. With many musical scenes, the voice actors were chosen for their singing ability above all considerations.

(Source: The Anime Encyclopedia)