From Nookipedia, the Animal Crossing wiki
Bugs are collectible items in the Animal Crossing series. Players can catch them with a net. They can be donated to the museum (much to the dismay of Blathers), sold, or placed in the player's home like a piece of furniture. Most of them are worth a lot less than most fish when sold. A large amount of bugs will only emerge during the summer, and there are very few during the winter. The bugs that sell the best are the horned Hercules and golden stag, they sell for 12,000 Bells each in Animal Crossing: New Leaf.
Bugs in Doubutsu no Mori
In the Japanese Animal Crossing game Doubutsu no Mori, there are 32 species of bugs.
Bugs in Doubutsu no Mori+
Bugs in Animal Crossing
In Animal Crossing, the number of bugs available increases to 40, an increase by 8 from the previous game. New additions are the ant, bagworm, mole cricket, mosquito, pill bug, pondskater, snail, and spider.
Bugs in Doubutsu no Mori e+
In Doubutsu no Mori e+, eight more bugs are added, making a total of 48.
Bugs in Animal Crossing: Wild World
The number of bugs in Animal Crossing: Wild World increases to 56, with the appearance of new bugs and the removal of some previous ones.
Bugs in Animal Crossing: City Folk
A total of 64 bugs appear in Animal Crossing: City Folk.
Bugs in Animal Crossing: New Leaf
Higher than all previous Animal Crossing games, Animal Crossing: New Leaf features 72 bugs.