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Garden Faries exisist...

But not in the way we thought.

A strange form of life borrowing traits from insects and plants with a human-like appearence.

This is a reality-check, is what I am about to suggest at all possible? What improvements need to be made to make it plausible.

Aside: how these faries evolved to be like they are is not important, as long as their present form is plausible.

The faries have elongated limbs (rather insectile but four limbs and one trunck/main body part, huminoid face) and large thin wings. This is to increase surface area to volume as they photosynthesise (have chloroplasts). The volume is further decreased by them not being taller than five centimetres. They must roughly conform, especially at a distance, to the general look of a european flower fairy

They do not fly but due to their large wings (butterfly like proportions), small size and hollow bones (faries are delicate) they can glide. (Mom I saw a tiny flying human in the garden!) I chose for them not to fly because I was worried it would be to energy intensive but it would be a bonus if they could.

To supplement their diet I thought they could, much like aphids, drink plant sap. (Who said faries love plants?). To do this successfully they would need a stylet like an aphid so maybe like scientists they kill aphids and use the aphid's stylets. Else they could have very thin fingers that can make a small hole which allows sap to gush out.

If they use aphid's stylets, faries would encounter hard times when aphids are sprayed to death (no more tools, no more sap).

So they would love to sunbathe and would stay around plants.

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    $\begingroup$ +1 for Aside: how these faries evolved to be like they are is not important, as long as their present form is plausible. $\endgroup$ – Zxyrra Dec 24 '16 at 17:53
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    $\begingroup$ Good question; I think it would be plausible, but I can't substantiate that. To note, though, you should consider their role in the food chain (birds might find them yummy?), and note that their brains would be too small to be interacting with humans in the classical way (like human-to-human). $\endgroup$ – Mikey Dec 24 '16 at 19:20
  • $\begingroup$ If they engage in photosynthesis, why would they need to drink tree sap? As long as they have soil to eat, water to drink, and sunlight they should be fine. $\endgroup$ – Isaac Kotlicky Dec 24 '16 at 23:23
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    $\begingroup$ Photosynthesis doesn't involve "eating soil". It's not particularly efficient, I would recommend having a more efficient energy source as their primary source, and photosynthesis as a supplement. $\endgroup$ – Malhar Khushu Dec 25 '16 at 1:59
  • $\begingroup$ Are there still things unclear/ missing in my answer? $\endgroup$ – Feyre Dec 27 '16 at 11:53
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Acquiring semi-hollow bones requires an intense evolutionary selection process, in combination with size selection(1). the lack of feathers makes the evolution of wings more improbable, but will still have evolved from the ability to glide.

They would not be Tetrapods, as they would have six limbs (wings are limbs). The faeries would be Teleostomi(2), alongside tetrapods and bony fish. So the faeries would be as closely related to us as bony fish are.

This means that a large family of animals exist with six limbs, with varies levels of gliding capability for the middle limbs. These limbs may have evolved alongside the other limbs from different kinds of fins, and might originally have been used as guidance under water rather than thrust.

Note that the fused arch (Synapsid(3)), evolved after the body plan of four legs. So there would need to be a significant amount of convergent evolution between tetrapods and our hexapods.

Note that your faeries may eat algae. The seaslug Elysia chlorotica(4) is able to make proteins necessary for photosynthesis through its ingestion of algae.

The prime marker for intelligence in a species isn't absolute brainsize, but rather relative in size to the body. The crow family consists of incredibly smart birds, magpies are even considered to be self-aware(5). It isn't impossible that the faeries would gain near-human intelligence, their heads would likely be a little larger relative to their bodies than with humans.

It is unlikely that the faeries would have such distinctive noses as we have. We are omnivores, and the faeries wouldn't have one canines or incisors. Humans have excellent vision, whether the same would apply for faeries is doubtful. The level of convergent evolution you're expecting is extremely unlikely.

That said, the high intelligence would likely lead to an ability to adapt tools. For crows this is the beak, for elephants the trunk, for bipedal hexapods, this would mean hands with thumbs.

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