Bonobos' calls may be the closest thing to animal language we've seen

Does anyone know if a tokenization attempt has been made at this type of research?

That sounds like the method the researchers used in the linked paper:

> The MCA is similar to a principal components analysis (PCA) but is conducted on categorical data: It performs a dimension reduction and then quantifies the statistical relationship between a specific utterance type and several FoCs (19) (see materials and methods)