The dominant species of Coronar are the Sekranij.
The main difficulty in describing alien beings is the sheer weight of background knowledge that you would be expected to have. Fortunately, the Sekranij are not so different to us, particularly in linguistic terms, so this brief description can probably suffice for now. Just keep in mind how strange it would be for a Sekranij to come across such a description that assumes no familiarity at all with them, and how much information it is not possible to relate here, either because it is still unknown to the ICL at this point, or because explaining it here would distract too much from the primary purpose of writing an accessible introduction to their languages.
The basic Sekranij body plan is not so unfamiliar. They have just the one head, two large eyes with eyelids and a nictating membrane, a bulbous nose, and thin lips. Above the eyes are two small pits, which give the Sekranij the ability to detect radiant heat (infrared). The top of the head has a feathered crest, slightly resembling that of a cockatoo but shorter, which can be raised or lowered. The crest is usually dark red in colour, although it sometimes can tend towards grey or black or even sometimes blue. The mouth and tongue are generally quite similar to a human’s, although the lips are not usually visible. Conveying shades of emotion – surprise, anger, fear, and so on – is primarily a matter of lowering of the crest, with much less use made than humans of facial muscles.
Where the neck joins the torso there is a pair of short limbs – the graspers – that have two digits each. The graspers are gracile, but the remaining two pairs of limbs are sturdier, especially the first pair (the midlimbs) which are the most muscular. The midlimbs and the hindlimb have three digits each. In infant Sekranij the midlimbs are underdeveloped compared to the hindlimbs, meaning that juveniles go through a phase of walking on the hindlimbs alone. Adults, however cannot easily stand upright on the hindlimbs and for most of the time they are oriented horizontally. The entire body is covered with very soft, downy feathers, resembling emu feathers, whose pigmentation varies from brown to russet to grey to blue to black.
If it wasn’t for the feathers, the colouration, or the number of limbs, from a distance a Sekranij might remind a human of a bear in general profile.
A Sekranij is considered to be an adult by many cultures by around 12 years of age, although growth can continue until 15. They can live to be as old as 90 (equivalent to around 140 Earth years).