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On an hot planet at the wooded poles are two aliens species that coexist in a mutually beneficial relationship.

The Honey Mouths use gecko-like feet to hang from the far larger Thorn Shredders, where they are protected from predators. They feed primarily on sap that leaks out from the damaged and uprooted trees that the Thorn Shredders leave in their wake as they feed. The gecko-like feet developed much earlier in the genus for climbing rocks and trees to escape predators.

The Honey Mouths take in far more sap then they require for their sedentary life, converting much of it into a syrup which they feed to their babies and the Thorn Shredder. The Thorn Shredders are the largest species in the biome and roam in small herds through the forests using their bulk and strong forearms to break and feed on the small fast growing trees of the forest.

The Honey Mouths, usually ten to fifteen per animal, crawl along their bodies; in addition to eating tree sap, they also take small pests, seed pods and gunk that gets caught on the Thorn Shredder's leathery skin. In the evening Thorn Shredders will take some of the Honey Mouths in their hands stroking them to get a mouthful of regurgitated sugar rich syrup.

When the Thorn Shredders have a baby, they use the Honey Mouths syrup to supplement the feeding of the baby for several months. Nursing Honey Mouths simply avoid the hands of the Thorn Shredders for the two months that they are feeding their own babies.

Is this a realistic relationship for the aliens?

Art is by Viki-Vaki from Deviantart.

Honey mouth alien Thorn Shredder alien

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    $\begingroup$ Fascinating question, but "They also feed primarily on sap that leaks out from the damaged and uprooted trees that the thorn shredders leave in their wake as they feed." and "The Honey Mouths, usually ten to fifteen per animal, crawl along their bodies eating small pests, seed pods and gunk that gets caught on their leathery skin." So, do the Honey Mouths eat the trees and therefore have to leave the Thorn Shredder or do they stay on the Shredder and feed on pests? Or do the Shredders give them small branches somehow? I am not sure how they get to the sap when the Shredder moves forward. $\endgroup$ – Sec SE - clear Monica's name Feb 7 '18 at 7:43
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    $\begingroup$ The thorn shredders generally take their time eating the trees that they can reach with their long neck and arms, then move a few feet ahead to the next bunch. So they can take half an hour moving twenty feet, stripping the leaves, bark and new wood bare. This gives the honey mouths plenty of time to climb or jump down, lick up as much sap as they need and climb back on board. Between large meals, when they just want a snack or the Thorn Shredders are moving without eating the Honey Mouths clean their rides. $\endgroup$ – Dan Clarke Feb 7 '18 at 7:51
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    $\begingroup$ Something else you should keep in mind: since the two polar regions are isolated from each other, their biota will have evolved somewhat separately. How separately depends on how much exchange there is across the equator. If the equator is uninhabitable, they'll be totally different; if lots of species' ranges cross the equator, their relatives will be similar between the poles, but species descended from non-crossers will be different between the poles. Think: polar bears in the north vs. penguins in the south, or marsupials in Australia vs mostly placentals elsewhere. $\endgroup$ – Gordon Davisson Feb 7 '18 at 20:43
  • $\begingroup$ Already thought of. The animals in the north tend to be larger and slower relying more on armour and size, they're also hermaphrodites. The equator has animals with plant/algae symbionts spending long periods of time hibernating mostly buried from the heat while their wide algae covered backs soak up energy. And the wetter south has faster lighter animals, that while hermaphrodites have near male and females, size and status decides who has babies. They mix thanks to cool highlands passing through the equator, but it's fairly easy to see where the animals ancestors came from. $\endgroup$ – Dan Clarke Feb 7 '18 at 21:55
  • $\begingroup$ Interesting creatures. "Honey Mouths use gecko-like feet to hang" No, because geckos hang using Van der Waals forces, which only work for very small, light creatures like geckos. They'd hang on by regular old paw gripping. $\endgroup$ – RonJohn Mar 15 '18 at 15:15
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It's called cleaning symbiosis

This is definitely a viable idea. To give you some information from the linked Wikipedia article:

Cleaning symbiosis in our nature

Cleaning symbiosis is a mutually beneficial association between individuals of two species, where one (the cleaner) removes and eats parasites and other materials from the surface of the other (the client). Cleaning symbiosis is well-known among marine fish, where some small species of cleaner fish, notably wrasses but also species in other genera, are specialised to feed almost exclusively by cleaning larger fish and other marine animals. Other cleaning symbioses exist between birds and mammals, and in other groups.

So while you will mostly find this behaviour when looking at small and bigger fish you will also come across cases where birds and mammals are living in such a symbiosis.

While it's often the case that you can find cleaning stations instead of riding with the host there is no reason to think that this should be the case with herds roaming through large forests.

Cleaners eat parasites - but sometimes also mucus and tissue

It's important to note that in fish for example the cleaner will often also eat mucus and tissue from the client and if the cleaner is too aggressive the client may stop the interaction - which may cause the cleaner to die, as they are often cleaning predatory fish that would normally eat them. You could add this to your alien creatures to show that the relationship between the individuals is important. Especially when the Honey Mouths are always with the Thorn Shredders it's important that either side keep an eye out for the other, because if the cleaner dies the client may die because of parasites or because he doesn't get enough syrup. After some time they may depend on this food source. And the cleaners may die if the client dies as they are not fast enough to keep up with the herd on their own.

Thorn Shredder death would be problematic for his surviving Honey Mouths

Another important fact is how the herd will for example handle the case of a dying Thorn Shredder - this leaves up to fifteen members of the Honey Mouths without food. They may distribute those to other members where the new Honey Mouths have to arrange with the existing ones. Or maybe they will fight with each other. Or they will simply try to keep up and wait for a place to become available.

You need pouches for baby Honey Mouths

As you have a cleaner species that is always with the client it's also important to keep an eye our for baby cleaners. They are extremely small in comparison with the client and you might want the client to have some niches or similar parts where baby Honey Mouths can be safely stored and fed by their parents without having to fear falling down. The amount of baby Honey Mouths might also be important to the client, as the client will not get as much syrup when the syrup has to be fed to the baby Honey Mouths and it's additional weigth, slowing down the Thorn Shredder and thereby making it more difficult for the Thorn Shredder and all the Honey Mouths to survive. The same goes for Thorn Shredder babies of course.

The amount of baby Honey Mouths can for example be regulated through pouches of the Thorn Shredder (thanks to G0BLiN for this idea). Each pouch is big enough for exactly one baby Honey Mouth to be nursed. This also helps when then grow - a young Thorn Shredder would have none or maybe one pouch, a bigger one can maybe have up to five. Only when a pouch is available will the Honey Mouth be nursed. If there are too many the others will simply die.

These pouches can be used to capture pregnant wild Honey Mouths

Or the pregnant Honey Mouth transfers to a different client with a pouch that is available. This way there could be a fluctuation of Honey Mouths in the Thorn Shredder herd. And it may also be a way to capture Honey Mouths - just place a couple pouches on a dummy Thorn Shredder and put the pregnant Honey Mouths there with some food.

Honey Mouth colouration should indicate "Here be yummy syrup"

In fish you will often find a blue striped coloration - independent of where exactly you are looking. This convergent evolution might be interesting for you, too. Your animals don't want to be too obvious, because they are always with their client and therefore don't need to attract other clients. Maybe they are very good at looking like tree branches, thereby increasing the camouflage. Or if the Thorn Shredders are so big that this is not really needed, which I take from your descriptions that they are leaving destroyed forests in their wake, you might want to add special colouration to them. A little yellow pattern on their back maybe or something else that symbolises "Here be yummy syrup".

You could have parasites that are very similar to Honey Mouths but feed mostly on tissue

This is also fascinating because you could have evil twins - parasites that look like Honey Mouths and feed like Honey Mouths, but don't feed the Thorn Shredders like Honey Mouths. This can be found in nature, too. They look like cleaners, but mostly feed on tissue while others do the cleaning. These are more difficult as your Honey Mouths would surely find them and want to get rid of those parasites, too. But maybe you have a special Honey Mouth species that specialises on not-being-picked at the evening and mainly eats tissue while the normal Honey Mouths do the work. If they sometimes feed the Thorn Shredders they could just as well merely be lazy Honey Mouths.

Herds need to meet to exchange Honey Mouths

The biggest problem is finding new Honey Mouths when yours died because of a disease for example. They are not living anywhere specifically, so your Thorn Shredders can't go looking for them. I recommend that different herds meet at regular intervals to exchange Honey Mouths - which is good for the gene pool of the Honey Mouths and might give your herd the ability to give Honey Mouths away if there are too many or get some if there are too few.

Baby Thorn Shredders inherit Honey Mouths from their mother

A similar problem arises when new Thorn Shredders are born. A newborn Thorn Shredder needs some Honey Mouths to be clean and not get infected. The best solution would be to have the mother Thorn Shredder give one of her Honey Mouths to her young. This makes room for another Honey Mouth on her, which might trigger the Honey Mouths to create another one. Once the new Honey Mouth is old enough to live on his own the young Thorn Shredder will be older and has enough place and parasites to shoulder a second Honey Mouth - as the Thorn Shredders are much bigger they will likely live a lot longer and mature more slowly.

Baby Thorn Shredders might also be a way for the herd to handle having too many Honey Mouths. It probably doesn't hurt to give a young Thorn Shredder one or two extra Honey Mouths, as long as you don't give a newborn Thorn Shredder a dozen Honey Mouths he will still be able to keep up with the herd and feed his Honey Mouths. Maybe it will be a bit harder and the young Thorn Shredder will have to stay close to his mother so that his Honey Mouths can forage some of the trees that are destroyed by the mother.

If you want to capture Thorn Shredders you can lure them in by being a Honey Mouth Exchange - or make that a tourist attraction

Thorn Shredder herds will seek out other herds that have Honey Mouths to give away when their supply is short or herds that need Honey Mouths when they have too many. This is perfect for you, because those probably long-living, giant, free-roaming Thorn Shredders will surely get to know you and your friends at the station or restaurant. Whenever they have too many Honey Mouths they will try to come to you to give them away because they know you will take them. When they have too few they will come to you to get some. Even if there is no need to get more or less Honey Mouths, as I have already mentioned it's beneficial for the Honey Mouths to change their clients from time to time so that their gene pool is more diverse.

These large, slow creatures will be detectable far in advance so you can easily check which state they are in and prepare accordingly. Treat them fairly, or basically just ignore them, and they will give you a fresh supply of wild-born Honey Mouths. Maybe you can make a tourist attraction out of this: Once per year a giant herd comes to trade their Honey Mouths.

Conclusion

It's a difficult balance because your cleaners are always travelling with the same client, but there is no reason why it should not work as you have protrayed it.

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    $\begingroup$ @DanClarke No problem. It's a very interesting concept. As the trees are growing fast you could easily take a few from the Thorn Shredders (careful, Thorn Shredders might not like this if there are not too many Honey Mouths currently) and keep them as pets, feeding them the trees from time to time. Maybe give them some places to climb (you could make a Honey Mouth restaurant, like japanese cat restaurants) and then pet them to get the syrup. By the way, the illustrations of the Honey Mouths are very cute. I wish you the best of luck with your project. $\endgroup$ – Sec SE - clear Monica's name Feb 7 '18 at 9:02
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    $\begingroup$ Humans have already domesticated the honey mouths and spread to every city and large town on the planet thanks to airships. Even poor street food vendors usually have one, keeping them well fed on sap and fruit juice while relaxing in a leather hammock. The good restaurants have a dozen each fed a different sap to give them different flavours. The Earthling in disguise who comes to the lost colony and has to eat the syrup after seeing the creature vomit it up, turns green even after eating it several times. The joys of having no honey bees. $\endgroup$ – Dan Clarke Feb 7 '18 at 9:09
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    $\begingroup$ And yeah they are so cute. I had an artist draw them, giving her the most basic description and telling her to go nuts. When I saw them, I wanted one for my very own. Cheers. $\endgroup$ – Dan Clarke Feb 7 '18 at 9:11
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    $\begingroup$ Excellent, thorough answer! Two minor ideas: 1. if the Thorn Shredders do have pouches for baby Honey Mouths, this can help the population control issue (e.g. if there are only 4 pouches, there won't be more than 4 nursing Honey Mouths at any given time). This can also be a reason for Honey Mouths to switch hosts, looking for an available "nest" - finally, the humans can use this instinct to capture Honey Mouths - by providing inviting nesting pouches on dummy Shredders. 2. Can you perhaps address what happens to new born Shredders? How do they acquire Honey Mouths? $\endgroup$ – G0BLiN Feb 7 '18 at 11:36
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    $\begingroup$ Honey Mouths would move from Shredder to Shredder because some honey mouths would be busy at especially good trees and would get left behind. They would climb onto the next Shredder to show up. Or whatever else showed up that would let them climb on - other macroherbivores would probably like the cleaning aspect even if they did not want the syrup. $\endgroup$ – Willk Feb 7 '18 at 14:08

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