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* When do the corvans evolve?

== About the corvans ==

Corvans are a species of giant flightless ravens who use language and manipulate tools with their beaks, tongues, and feet. (Though calling a corvan a "raven" is often an insult.) They speak using their highly developed syrinxes.

Corvan tools often have handles so they can be picked up and carried with corvan beaks or tongues. As they can't carry heavier loads by themselves, they rely on carts, vehicles, pockets or bags for carrying cargo. Corvans invented wheels shortly after they evolved and then spread all over the world in just a few millennia.

Since corvan feet are almost as dextrous as human hands, computer technology often uses input devices and touchscreens placed on the ground.

Corvans don't have to rely as much on central vision; from using beaks and tongues their proprioception (for example sensing and predicting their own position in space) is better than humans.

Corvans are hardwired to fear large land predators and certain poisonous animals that live on land, and species that prey on corvan eggs are regarded with much more disgust. Like in human culture some apex predators are commonly used as symbols of power.

Corvan spoken language uses both the syrinx and the tongue. Since they have no lips and no teeth they cannot make labial or dental sounds. However, they can do a lot with their syrinxes and even produce two vocal tones simultaneously.

Corvan sign languages mainly use tongue, wings, beaks, and feet. Deaf corvans are almost always congenitally deaf; it is very rare for a corvan to become deaf later in life, as avian cochleae are self-repairing.

Like human music, corvan music displays enormous diversity and their instruments have similar basic mechanisms (strings, winds, membranophones and idiophones). One difference is that they place more emphasis on timbre than humans, since the upper limit of corvan hearing is about an octave higher.

Many corvan cultures do not consider simple dyadic harmony or low-complexity-JI-based harmony to be musical per se, any more than speakers of human tonal languages consider their language to be musical. Particularly, speakers of the bitonal language [????] have evolved an impressive Zheanism-like musical tradition utilizing extended high-overtone harmony, various JI colorings of the intervals used in speech, and extremely precise vocal control.