The Yellow Butterfly is an insect that can be found on flowers around town. It will appear from 4AM to 7PM in March to June, and from 8AM to 4PM in September. When selling it to Re-Tail, the player will earn 90 Bells.
Location
The Yellow Butterfly is found is found flying near flowers in town and on the island.
The Museum
The Yellow Butterfly can be donated to the museum. Upon doing so, the following text is given by Blathers:
"The yellow butterfly is similar to the common butterfly, with the two easily mistaken for one another. Males are more often a yellowish color, and females are more often white. The larvae feed on plants of the Fabacae family, such as milk vetch or white clover."
Quote
Upon catching the insect, the player will say the following:
"I caught a yellow butterfly! Now to catch a toastfly!"