What animals that can be found in gardens and range from 0.2 mm - 4 mm could be a possible candidate for domestication to a race of tiny humanoids?
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2$\begingroup$ ok, my curiosity is getting the better of my: would you mind explaining the sudden influx of questions about microscopic life? youve asked something like seven or eight in the last few days by my count; are you writing a story or something? i, for one, would be pretty interesting in reading it, based off of the questions youve asked. $\endgroup$– Duncan UrquhartMar 5, 2016 at 23:45
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1$\begingroup$ @DuncanUrquhart That , my dear asker of questions , is precisely what I am doing. I tried this once , but to my dismay there is a stark lack of speculative questions about microscopic people on the web .So you know what they say , if you want something done ( right ) you must do it yourself . ( and thank for the compliment , it is much appreciated ) $\endgroup$– user15036Mar 6, 2016 at 1:33
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They are a little above your size range, given that they grow up to 6mm, but aphids already have been domesticated by ants in the real world:
Scientists had previously established that certain types of aphids live in colonies where they are used as a food source by a neighbouring colony of ants. The ants have been known to bite the wings off the aphids in order to stop them from getting away and depriving the ants of one of their staple foods: the sugar-rich sticky honeydew which is excreted by aphids when they eat plants. Chemicals produced in the glands of ants can also sabotage the growth of aphid wings. The new study shows, for the first time, that ants' chemical footprints -- which are already known to be used by ants to mark out their territory - also play a key role in manipulating the aphid colony, and keeping it nearby.
answered Mar 5, 2016 at 20:57