Insects who fly on Wings of a Feather!
Fairyflies are the smallest insects in the world. They’re wasps who lay their eggs inside the eggs of other insects, providing their young with food.
Feather-winged Beetles are the tiniest beetles. They eat fungus and their miniature wingcases hide their splendid feather-wings.
Thrips are another tiny insect who use their piercing mouthparts to suck out the innards of plants, pollen and fungal spores.
Finally a Many-plumed Moth! Each wing is transformed into a whole collection of tiny feathers, adding up to about 20 in total.
I guess birds are just inefficient..