Hyrax song is made up of between three and five distinct sounds called "syllables". 

Wail (W), Squeek (Q), Tweet (T), Chuck (C), Snort (S)

A sequence could look something like this:

W C C Q Q Q Q Q Q Q Q Q C T Q C Q C C T Q

 

My research has found that:

1. The order of syllable isn't random, but there are distinct syntactic patterns to the song. More and more species are being shown to vocalise with complex syntax, giving possible clues to the evolution of human language.

2. Hyraxes living nearby to each other have syntax that is more similar to each other than hyraxes living further apart. It seems that animals may actually copy the syntactic structure of their neighbours; implying that they have a comprehension of the nature of syntax.

3. Male hyraxes sing more complex songs when other animals are more likely to be listening. This may indicate that females (and/or competitor males) are using song complexity to assess male quality.

4. The mathematical structure of the syntax bears more resemblance to linguistic syntax than people previously thought. We have no indication how human language could have evolved from animal communication so very different from our own. But recent studies may indicate that the algorithmic gap between the two may not be so severe.