incomplete description and no finished art yet, but I have been reworking a previous WIP into a genus submission after positive reception from the team and getting the okay from mni, and I feel like posting for potential feedback I guess.
This may end up being one of the longest and most detailed genus group entries once it's done. Which is probably a good thing for setting precedent, since we don't want creatures like this to be submitted as vaguely as the poorly executed early genera from before the limbo.
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Krikrees (Parusvolucrus spp.) (titmouse winged-things)
Creator: Disgustedorite
Ancestor: Ferry Quail
Habitat: Wallace, Koseman
Size: 10-20 cm long
Support: Endoskeleton (Hollow Chitin)
Diet: Omnivore (Wingworms, Minikruggs, Vermees, Teacup Sauceback larvae, other small binucleid worms, and their eggs; Gamergate Gundis, small Neuks and their descendants, and other small squishy fauna; seeds, nuts, megaspores, and small crystals)
Respiration: Active (Unidirectional Microlung Network and Air Sacs)
Thermoregulation: Endotherm (Feathers)
Reproduction: Sexual (Male and Female, Hard-Shelled Eggs in Nest)
Krikrees split from their ancestor and diversified. To the degree that the interbiat is like a chicken, that the quail raptor is like a quail, and that the ferry quail is like a robin, krikrees are like titmice. These tiny winged saucebacks are highly adapted for life in the trees, but will sometimes land on the ground to hunt and forage. They can be found all over Wallace and Koseman, anywhere where trees or large shrubs such as snowflake obsidioaks and ferries are present.
==Anatomy==
(Gallery: Musculoskeletal Diagrams)
Krikrees have a stouter, more compressed shape than most biats, even more so in proportion to their size than ophreys, and long legs suited to strong flight and moving through trees. They have short, strong beaks which can break through the shells of minikruggs, seeds, and small crystals.
Krikrees are strong fliers yet retain two free toes. This is enabled by the partial sclerotization of the tendon which folds the primary flight feathers, which stabilizes them and allows for much longer primaries than can normally be present on a didactyl species, granting krikrees the benefits of both strong flight and a stable foot posture. This trait is also present in the related Martyk mega quail. (Conversely, monodactyl biats such as ophreys typically lack this tendon at all, as the wing toe completely takes over its role.) This structure holds the feathers very strongly until they are ready to be molted and replaced, and as such it is rather difficult to pluck a primary without injury.
===Eyestrils===
The imperfect compound eyestrils of their ancestor have fused into a single sparkling pair bearing numerous individual eyestrils, which grant krikrees acute image formation compared to other jewel-eyed saucebacks as well as excellent movement detection. Due to their structure involving mirrors and a retina at the front of the eye, unlike the compound eyes of terran arthropods and certain unrelated ukfauna, krikree compound eyes have an external skin component (also present in the single-eyestrils of other jewel-eyed saucebacks) which can be pigmented without impacting their function. This is the reason for their differing appearance from standard compound eyes.
The component eyestrils can still be compressed to focus using tiny muscle fibers running through the compound structure, granting krikrees much better image formation than standard compound eyes. This is possible to accomplish due to the eyestrils being mirror eyes, where the shape of the eye itself is adjusted to focus instead of a separate, smaller lens.
Similar to the eyestrils of their relatives, krikree eyestrils have open pupils that let air in to smell and they must flush them with tears to remove debris. When krikrees cry, their eyestrils swiftly overflow and form relatively large tear droplets on the surface of the compound eye. This is because shaking off a large droplet removes tears from multiple eyestrils at once more effectively than trying to remove a much smaller volume contained only in each, due to surface tension and momentum. As this also results in more water loss, they only do this when debris starts to impact their vision (they can afford to wait due to redundancy) or when they need to remove a parasite.
===Respiratory System===
The respiratory system of krikrees is compressed entirely inside the hip girdle, effectively making the body cavity end at the cloaca, unlike in other saucebacks where most of the respiratory system is post-anal. Similar to the unrelated ophreys, the microlungs of krikrees are fused into a unidirectional system, but unlike ophreys which have a single pair of macrolungs, krikrees still have three distinct pairs of microlungs. In fact, the missing fourth pair (technically the third, when starting from the sauce and counting along the pulmonary vertebrae) is still present as well, but it has transformed into tubing which connects the other three pairs and no longer has corresponding external spiracles (leaving krikrees with just three pairs). Breathing is powered by the postpelvic gastralium, which is vertically oriented at the back of the hip and is roughly Y-shaped.
When a krikree inhales, air flows into the rearmost pair of microlungs. It then pushes the air through the tubing into the two frontmost pairs, one located near the hip socket and the other nearly up at the neck. Their unusual location makes a krikree’s body more lightweight, similar to the function of air sacs in terran birds. These continue to take in oxygen from that same air while the hindmost pair inhales again before pushing the next breath through, expelling the previous breath from the first two pairs of spiracles. This system is slightly more efficient than the wave flow system employed by ophreys, as only one pair of microlungs powers the entire system.
Extensions of the first and second pairs of microlungs form air sacs which run up the neck and thread into the wing bones, respectively. These extensions serve no purpose in absorbing oxygen, but do make these body parts lighter.
==Behavior==
Krikrees are social creatures which form large social groups consisting of a large flock residing in one tree or a group of trees that splits up into smaller flocks to forage over a wide area. When foraging on the ground, they will frequently join other biats, skysnappers, and phlyers to form mixed-species foraging groups, which are safer from predators than smaller single-species groups. With their superior hearing (compared to skysnappers and phlyers) and eyesight (compared to other biats), they can notify other species of danger with their warning calls and abrupt flight.
===Foraging===
Krikrees are capable of brachiating, swinging along the underside of branches to catch prey that use the undersides of leaves and branches to avoid less-agile predators. To move to a better location more quickly, they can hold on with one wing and flap the other to gain enough momentum to swing back to the top of the branch, where they are also very good at keeping their footing when running along thanks to their long, semi-opposable toes and didactyl foot posture. Krikrees are also capable of foraging on the ground, where they source the majority of their food over winter.
The frequency of the two strategies during the summer correlates with the size of the species, with the largest ones spending more time on the ground and the smallest ones mainly hunting in the trees. In wooded and shrubland biomes, a minimum of three krikree species will coexist partitioning between ground foraging, larger branch foraging, and smaller branch foraging, similar to Earth’s titmice.
Several species in regions with cold winters will engage in food caching in the fall, allowing them to stay healthy over winter.
===Vocalization===
(Image: A krikree singing. “The twinkle-twinkle krikree (P. scintillare), native to the temperate woodland regions of Koseman, produces a mating call which sounds remarkably similar to the popular lullaby ‘twinkle twinkle little star’ when slowed down.”)
The namesake call of krikrees is produced not by their lungs, but using stridulation. Like other saucebacks, they can produce chirps using their tongue. However, this ability is exceptionally advanced in krikrees. The tongue bears many chitinous bristles, which a krikree can adjust the arrangement of simply by extending or contracting it. It opens its mouth and rubs its tongue against its specialized oral spines, which themselves bear tooth-like serrations, causing them to vibrate and produce sounds which are amplified by the shape of its mouth, like a phone speaker placed in a cup. The sound is more similar to a cricket or other insect chirp than to a bird chirp in how it’s produced, despite the creature’s birdlike appearance. Each oral spine corresponds to a specific note, while the adjustment of the tongue alters the exact pitch, allowing for vibrato and other effects. The tongue can also rub against multiple oral spines at once, allowing for chords.
Krikrees stridulate almost continuously to communicate with others in their flock, as long as they are awake and not frightened by a predator. The namesake “krikree” is actually an alarm call to warn others of a predator so that they may hide. Other calls include a social trill which sounds similar to a cricket chirping and a “chittering” used by juveniles that have not yet gotten the hang of stridulation. Krikrees are still capable of making “creaking” sounds with their lungs, but this is now restricted to the equivalent to a threatening growl (primarily heard in territorial conflicts), as stridulation has completely overtaken it in effectiveness for communication.
===Defense===
Though krikrees are small, they do not live helplessly in fear of predators that might eat them. When a threat is identified, after the flock has fluttered to safety, they will continue to make their alarm call at the threat until it leaves. If it does not, a few brave individuals will start harassing the predator, nipping at vulnerable body parts such as eyes, ears, and wings and using dive-bombs to throw them off balance. Some species may also land on the predator’s head and attempt to shove sticks and leaves into its orifices, primarily the eyes, nostrils, and ear canals. They are usually successful in the end, as even if they do no lasting harm, the predator will still eventually tire of the harassment and leave. This allows them to safely resume foraging without further risk.
===Reproductive Behavior and Nesting===
(Image: A krikree at a nest full of babies)
At the start of the breeding season, which typically begins in the spring, krikrees become more territorial, as they must compete for both mates and ideal nesting grounds. Krikrees prefer to nest in natural cavities such as tree hollows, though they will also use abandoned constructed nests formerly belonging to other organisms, such as xenobee hives, if better options are unavailable. Krikrees seeking a mate will broadcast with song, producing rhythmic melodies that are species-specific and often incorporate chords due to their ability to sing multiple notes at once. The female is usually the one making a mate selection rather than it being mutual, resulting in some species being sexually dimorphic. Their tail barbs aid them in holding on to mate, a task otherwise made difficult by their leg-wings getting in the way.
A nest is constructed in the cavity using dry leaves, feathers, fur, trichomes, and plent cotton as bedding. The female then lays a clutch of eggs, as few as 2 in some alpine species and usually somewhere between 8 and 14 in most others. The hard-shelled eggs hatch into blind, pink, featherless chicks that are completely dependent on their parents for survival. The pair stays together throughout the breeding period, producing multiple broods of eggs to maximize the chances that at least one chick will survive, and part ways in the fall. Some species remain monogamous, choosing the same mate every year provided it’s still alive, while others, especially the more sexually dimorphic species with more visually striking males, may form different pairs each year.
===Tool Use===
(Image: A krikree using a ferine needle to access a food item inside a log)
Krikrees are fairly intelligent among biats and some species, particularly larger ones, can use simple tools to extract prey while foraging. The tools are natural, rather than crafted, typically being something like the needle of some sort of ferine being used to extract a worm from a log. Seeds and kruggs too large and tough for them to break open on their own or by pressing against a hard surface will sometimes be smashed with small rocks.
==Diversity==
There are around 50 species of krikree, which can be divided into three main subgenera: Dixon krikrees (left), Darwin krikrees (right), and Koseman krikrees (bottom). Dixon and Darwin krikrees are broadly similar due to semi-frequent hybridization permitting gene flow in central Wallace, while Koseman krikrees are slightly more distinct, their most externally obvious difference being the long black rachises extending past the vanes on the ear feathers in males. Koseman krikrees are also sometimes found in southern Wallace, contrary to their name, which permits hybridization with the other two subgenera. However, in general, female krikrees of the Dixon and Darwin subgenera don’t seem to have the same taste in ear feathers as female Koseman krikrees, which limits the spread of the elongated rachises further north.
Apart from this, general coloration trends can also be seen in the three subgenera: Dixon krikrees are frequently white, gray, or pink; Darwin krikrees are frequently red-brown or yellowish; and Koseman krikrees often incorporate contrasting black and white patches. Males may also be more colorful or otherwise more striking than females, regardless of subgenus, with green or blue patches on the chest or throat being common. Males also frequently have blue or green eyes, while in females they will be pigmented similarly to the surrounding feathers for camouflage.