The smallest insects, a type of butterfly or extinct fairy flies are a type of lost, and they're the smallest insects on earth, even if you don't want to eat insects like we discussed last Friday, Scientists say 3/4 of our crops depend on insect pollination, And a new report from the United Kingdom Wildlife Trust says there have been massive decreases of certain insect populations in the UK Between 1968 and 2007 The report says, the number of large moths in Britain fell by 28% and that many butterflies also disappeared.