Banded dragonfly

''Whoo hoo! Did you see that? Did you? I caught a banded dragonfly! -Animal Crossing: City Folk''

Donation in City Folk
It is located in the middle of the first exhibit (the one with the flowers), and occasionally lands on the rock. Blathers will say: "Banded dragonlies are rather flashy... Just look at those piercing green eyes. The black and yellow body! Not to mention their sheer size and--OH, HORRORS! The beast is looking right at me! Look away, fiend!"

Encyclopedia Info
In Animal Crossing: City Folk, the encyclopedia says, "These got their name because of their tigerlike banding and evasion skills."