Common bluebottle

The Common Bluebottle is a bug that was added in. It can be seen flying around during the day from April to August. It sells for 300 Bells.

In New Horizons
"The common bluebottle is a type of swallowtail butterfly with a bright blue line running down its wings. They fly quite nimbly, it seems, and are thus quite difficult to catch. But seeing how they've been known to slurp nutrients from MUD puddles... I simply CAN'T imagine wanting to catch one myself. What awful breath! "

Once donated, the Common Bluebottle can be found flying in the butterfly room in the Bug Wing at the Museum.

Trivia

 * "Bluebottles" are also a type of blowfly, but the Common Bluebottle is a butterfly.