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Here I have uploaded 1) a spectrogram of a typical call, 2) a clip of a single call, and 3 - 9) the raw recording that I took of a single male calling in his pool.
Notes: Despite there being multiple pools at the type locality, and having found an abundance of adults at the same site previously, only 3 males were heard calling on each night (13 and 14 June). The three males were spread out within boulder complex, probably at around 10-30 m from each other and always in different pools. All of this was after heavy rain in the days and hours preceding.

I would appreciate if anyone has any theories as to what triggers breeding for this species, that is assuming they form aggregations like other Caco species

Description from the paper

A total of 20 calls from the holotype specimen (PEM A15391) were recorded at the type
locality over a period of 18.5 minutes. Air temperature during this time was 10º C. The call of C. cederbergense sp.
nov. can be described as a short, pulsed bray emitted singly at long intervals (58.3 ± 97.23 s, Fig. 9a, Table 3). It has
a mean dominant frequency of 1.8 ± 0.03 kHz, and a dominant frequency range of 0.92 kHz. Calls have between
18 and 26 pulses at a rate of 90.6 ± 7.35 pulses per second. No territorial call was heard, but no more than a single
male was heard calling in a pool at the Type Locality.

11 Individuals found in total, of which 4 were juveniles. Found under flat rocks resting on a moist substrate. Another population found 3km SE. Many tadpoles of similar sizes found in three of the deepest pools.

Cacosternum cederbergense Cederberg Dainty Frog or Cederberg Caco. From Cederberg, Western Cape. https://www.tyroneping.co.za/amphibians-of-southern-africa/cacosternum-cederbergense-cederberg-dainty-frog-or-cederberg-cac0/

Sabah Pit Viper
www.matthieu-berroneau.fr

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Borenan Dark-necked Slug Snake (Asthenodipsas borneensis)

https://youtu.be/071uogTZ1Ro

Range: The island of Borneo.

Habitat: Mature forest.

Place in the ecosystem: The Bornean Dark-necked Slug Snake and its close relative the Malayan Slug Snake are unique among slug snakes in that they appears to feed exclusively on slugs and not snails. This could be why unlike other slug snake species they shows no asymmetry in its jaw and tooth structure.

The Bornean Dark-necked Slug Snake was once considered the same species as the Malayan Slug Snake (Asthenodipsas malaccana) despite quite clear visible differences. A January 2020 paper by Quah et al. described them as distinct species for the first time.