There is some evidence of "gesturese" in great apes. So it could just be absent in the vocal modality but very much present in others! Would be super interesting to look at it through a multimodal lense for sure!

5/5 Finally, this study would not have been possible without @nccrlanguage.bsky.social

4/n But all great apes hear quite a large amount of surrounding vocalisations as well (except for the semi-solitary orangutans).
We suggest early hominins probably relied on surrounding communication while infant-directed vocal communication became more prominent with human language!

3/n After all that time in the forest, we compared the amount of immature-directed vocalisations across all great apes including humans!
While there is some instances of immature-directed vocalisations in non-human great apes, the difference between infant directed speech is huge!

2/n Infant or child-directed speech is very much present across multiple human cultures. But what about in great apes? We sampled vocalisations from wild populations of bonobos, chimpanzees, orangutans and gorillas

Ah that would be wicked! I think I have a few more bird pics coming soon actually! Thanks!