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 . The butterfly is also a swimming stroke, named for the gracious movement of the butterfly. The mosquito is a two-winged fly of the family Culicidae .