There are an incredible number of very small insects in the world, far more than there are giants. Many beetles are less than one millimeter in length, and the North American Feather-winged Beetle Nanosella fungi at 0.25mm is a serious contender for the title of smallest insect in the world. There are many small Hymenoptera, especially in the Superfamily Chalcidoidea, such as the Fairy Flies, of the family Myrmaridae, of which Alaptus magnanimus at 0.21mm long was once thought to be the smallest insects in the world, however another Hymenopteran parasite now holds the record. Megaphragma caribea from Guadeloupe measuring out at 0.17 mm long is now probably the smallest known insect in the world. Insects are a member of the class Insecta , and phylum Anthropda .
Insects have an external skeleton.
Most animals, including humans, have an internal skeleton. Insects are the largest group of all living creatures. More than 1,000,000 species are known. The monarch butterfly migrates thousands of miles each year from Canada to Mexico. Butterflies are an insect of the division Rhopalocera, of the order Lepidoptera .