There won't be a summary for this one! It's just a little tale, perhaps about Slough Week and all.
Oh yeah, the time reference of this is based on my geological era catalog.
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Geologic Periods

Jvanic Era (First Turn 2 Jvan post)

Antiktyposoic Era (Slough Falls into Galbar)
-Early Rottenian (First Turn 2 Slough post)
-Late Rottenian (Second T2 Slough post, Second Jvan T2 post)
-Glitian (White Giants, Slough through the Savannah)
-Zephyronian (Mass-extinction due to the changes in the landscape)
-Flamourian (Another mass extinction thanks to the Ashlings)

Esaulic Era (Esau is created to protect Slough)
-NeoGlitian (Glit Savannah expands)
-Kaliosian (Meimu starts to boost flowers. Toun creates the Hain. Reathos bring the apex predator into play. Fiberlings are created. Fractal sea boom by Slough and Jvan)
-Formican (Ants change the land, giant ants cause instability and extinction ensues)
-Firewindian (Firewind desert’s change. New species and new climates are created)

Ikanotita Era (Rise of the able species)
-Hainiary (Hain expansion)
-Anthropini (Human Arrival. Angel’s Creation)
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[h3][b]The Genetic Saga of the Furls[/b][/h3]

[url=http://www.roleplayerguild.com/posts/3384997](Based on this post)[/url]

The origins of this order can be traced to the second great irradiation of life that happened on the Late Rottenian, where the first fossil records of the Snowy Furl (Furlidae Boletus) and its close relative, the Deepwood Sloth (Megaurlpus Obscuro) can be found. While the Sloth had a very easy grounded life, being large enough to be untouched by the predators, the Furl had not only to struggle to find food but also to survive against the many threats that the primeval jungle offered.

This resulted in a very versatile species, with patagium that permitted it to fly across the dense jungle and an omnivore nature that contrasted the Deepwood Sloth's herbivore diet. As such, it was no surprise that when the Glith Savannah started to form, the Furls were one of the first species to take over the many new niches and opportunities. This generated a great boom in the numbers of the order, dwarfing the numbers of Deepwood Furls, their size also started to increase, in some cases dramatically, and with enough time, many new families started to form, two who became particularly successful were the Beaked Furls and the Flea Furl.

Beaked Furls had a quick spread because of their specialization, long beaks that could reach the burrowing species that the Fleet-Footed Mangler was unable to hunt. The deeper it could bite, the more food it had, due to that natural selection acted quickly in making some of these creatures enormous, the Towering Terror (Furostro Gigacollum) is to this day the largest that a Furl would ever get. 

The Zephyronian extinction swooped out the smaller carnivore Beaked Furls, the Herbivores found themselves quickly displaced by the dynamic Birbs. The megafauna like the Towering Terror became less common but survived that extinction, however, when the Ashlings the creature's slow movements made it an easy prey, that was the last nail in the order's coffin.

The other "winner" of the era, the Flea Furl (Furlidae Exhibuit), kept itself true to what made the Furls survive so far, dynamicity and climbing. Brush Beasts, with their large and wonky body and many unreachable spots on their skin, was the perfect breeding ground for many insects and vermins. The flying Furls from the Deepwoods were the first to take advantage of abundant food "growing" on the gargantuan creature's skin, but they were quickly displaced by birds and other larger species. The proto-Flea Furls were a quadruped, ground-bound, species, but the sights of large and succulent maggots growing on the legs of the beast inspired it to start to climb those legs. Natural selection took its course and the more agile species got the most food, and by the time the first Furls had climbed all the way up to the beast's back they had become quick enough to fight against the many flying terrors that also lived up there.

In the backs of the absurd beasts the Flea Furl had an easy life, insects, larvae and birds with their eggs were all part of their diet. Due to the nurturing habits of the Brush Beast, it was also quite easy to jump from one beast to another when one was far too old. The Zephyronian and Flamourian events did not affect them in any way, but those peaceful times would end soon.

In the early times of the Kaliosian the Heraktati arrived, not even the Brush Beast could resist the beast. The Furls saw their homes that were supposed to live up to a century dying out in their thirties, the ones who decided to fight against the ferocious beast would be the ones to survive these troubled times. The Flea Furls had already the seed of sociability from their habits over the last epochs, this new challenge helped to select the most organized groups that could successfully gang up on the "invader". 

Of course, Reathos' pets were a formidable beast, and the gangs often lost half of their members in the defense of their home-beast. With the time that favored the clever and strong, who with time became their own species, the Soldier Furl (Furlidae Pugnatore). While the adaptability of this species was originally a way to preserve their home, it also showed the way out. Sometimes, the gang of Furls would simply not see the need to leave the carcass of a recently deceased Brush Beast. Why bother with climbing up those things when you can peacefully live among the bones of the giant?

When the Formican Expulsion and the climate changes of the Firewind Desert happened the few Soldier Furls who lived at the border of the savannah decided to go west, into the jungles, valleys, and mesas, instead of returning to the back of Brush Beasts. Those would be the only family of Savannah Furls to survive, as the new boom of flying beasts from this epoch took a hard toll on the already dwindling Flea Furls.

On this new habitat, the bipedal species ended up having the advantage, all of the radiation of the era had the species taking advantage of being able to stand up and look around. The Saber-Tooth Brute (Furlid Brutus) was one of the first species to stand out, expanding on the strength of its antecessors this gorilla-like creature managed to become an untouched herbivore-insectivore like the distant, yet similar, Deepwood Sloth. With habile hands and sharp claws, this creature specialized on cutting thin trees down to eat their fruits, leaves, sap, and insects. Despite all this deftness, the slowly breeding creature saw its numbers decreasing dramatically with the rise of Hain and Human hunters, now only living in distant and unknown areas.

Other species which managed to strive well was the Kompsoid (Furlid Elegans) who with its thin frame and delicate hands managed to strive well in the caves near the valleys and plateaus. The tail and patagium give the creature a good sense of balance and mobility. Recent changes did not make its life worse, on the contrary, the presence of luminescent flowers and fungus in the region just made its numbers rise, as this creature could camouflage itself among the faint lights quite well.

END (For now!)

[url=https://upload.wikimedia.org/wikipedia/commons/6/6b/Life_restoration_of_a_group_of_giant_azhdarchids,_Quetzalcoatlus_northropi,_foraging_on_a_Cretaceous_fern_prairie.png]Oh by the way, towering terrors, they were actually a thing, freaking pterosaurs no less[/url]