Aphids
aphids have two pairs of wings, one of which is much larger than the other. For a large part of the season an aphid population consists of viviparous females [...] very large group of insects: the super- family Aphidoidea, belonging to the order Hemiptera . The aphids discussed here all belong to the family Aphididae [...] life cycle, with both winged and wingless forms of adults of the same species developing, depending on the conditions. Wingless adult aphids are known as