Favoritos de olvr_a

Perhaps Breviceps rosei vansoni.
I posted a pic of the frog some time ago. This is the first time this season I've heard its call as we've had gentle rain. @olvr_a

https://www.inaturalist.org/observations/190656424

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.

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/

A new species of Dainty Frog (Anura: Pyxicephalidae: Cacosternum) and the first endemic anuran to the Cederberg region of South Africa OLIVER ANGUS+ NICOLAS TELFORD+ TYRONE PING+ WERNER CONRADIE+ https://mapress.com/zt/article/view/zootaxa.5512.1.1

A small group of these (never more than 10 adults, usually about 5, I reckon) has been living in this well in an ephemeral rocky riverbed for at least 6 years. Well about 2 m diameter and 3 m deep, fed by a slow natural spring.