When was the coconut thief born on animal crossing wild world?

In "Animal Crossing: Wild World," the Coconut Thief is a character associated with the game's events. He doesn't have a specific birth date like other characters, as he is more of a seasonal event character rather than a regular villager. He appears during the summer months when players can find coconuts on their beaches, but his exact "birth" or introduction to the game isn't defined by a specific date.