There is a similarity among all these above mentioned organisms
Fruit fly
Mosquito
Butterfly
Bees
Wasps
Dragon fly
House fly
All these organisms belong to the Kingdom Animalia, Phylum Arthropoda, class insecta
That means all these organisms are insects!
The mosquito, fruit fly and housefly belong to the same order diptera but differ at the family level i.e. they belong to different families.
The bees, wasps, dragon fly belong to different orders.
ORDER: Diptera
True flies are insects of the order Diptera, the name being derived from the Greek di- “two”, and pteron “wing”. Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced mechanosensory organs known as halteres, which act as high-speed sensors of rotational movement and allow dipterans to perform advanced aerobatics
FRUIT FLY:
Family: Drosophilidae
MOSQUITO
Family: Culicidae
HOUSEFLY
Family: Muscidae
All the images or pictures of these insects shows that they have one pair of wings and one pair of halteres hence belonging to the order diptera.
What makes these flies different is that
They all belong to different families.
Families which has different characteristics
Talking about Birds
Birds belong to a different phylum which is the Chordata
Chordates possess a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail: these five anatomical features define this phylum. Chordates are also bilaterally symmetric, and have a coelom, metameric segmentation, and circulatory system.
While the fruit fly is an arthropod;
Arthropods are invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages.
Invertebrates are animals that neither possess nor develop a vertebral column
The main difference between an arthropod and a chordata is the presence or absence of vertebral column.