Nayabaru are descendants of Cretaceous iguanodonts. They are about twice as tall as a kavkem. They're still equipped with a tail, but it's much shorter and more monkey-like than that of their ancestors. Their faces have lost any semblance of a beak in favour of expressive lips. They are still capable of very loud vocalisations that would aptly be described as bellows.
They're smooth-skinned and their colouration is usually not far removed from a dull green. Their irides are typically blue or green, and their white sclera is clearly visible, as it would be in humans.
Generally speaking, Nayabaru have much in common with humans - although not quite enough to likely get along with them in the long-term. Their expressive faces are armed with many facial expressions familiar to humans (including the notion of a grin (albeit only ever malevolent), despite not having a predatory evolution to guide it).
However, their culture and social structure, while at first glance fully compatible with humanity, is quite different.
The most notable trait they share with their ancestors are the thumb-spikes and the opposable pinky.
The Nayabaru have a slight tendency toward matriachic social structures, and they feel better in groups. The highest form of punishment Nayabaru of all social groups know is to ostracise a Nayabaru.
Quite remarkable is the Nayabaru near-inability to lie, an attribute especially vivid in conversation with other Nayabaru. Even a lie by omission is typically deeply psychologically painful to a Nayabaru. While Nayabaru can typically easily rationalise why they should not adhere to Nayabaru values, actually breaking them often rapidly disabuses them of the notion that it was a good idea to do so, causing them to regret their actions and confess their deeds.
Despite being smooth-skinned and bipedal, Nayabaru have very little urge to clothe themselves - however, they do believe in festively decorating themselves for formal events or gestures of increased respect. These decorations usually come in the form of what might be best translated as 'banners', which are indeed strips of cloth with patterns on them, often wrapped around shoulders and upper arms, or draped around the neck like a loose scarf, or simply held up exclusively by other banners.