Ten Largest Bugs On The Earth. There are actually 11 kinds of Large Weta, many of which are bigger than other weta, inspite of the latter already being large by insect standards. Large species can depend on 10 cm not including legs and antennae with body weight usually no greater than 35g. One captive female reached scores of about 70 gm, which makes it on the list of heaviest documented insects on the earth and heavier than just a sparrow. Giant Weta are usually less social and a lot more passive than other Weta. They’re found mainly on New Zealand offshore islands, having been almost exterminated on the mainland islands by introduced mammalian pests.