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There are around 70 different species of weta endemic to New Zealand. They are very large and heavy, although some can fly. Most are nocturnal and are predatory, with the exception of the giant weta and tree weta which eat plant material. The giant weta can reach up to 100 mm (4 in) in length (excluding outstretched legs and antennae). Because New Zealand was mammal free (apart from 3 species of bat) wetas occupied the same position as rodents in the natural ecosystem.
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