On my 3rd day working on this project a I recorded a group of around 20 to 30 juveniles Whiprays resting under a Mangrove tree's shade at high tide.

I spent a couple of hours in the water with them being very still until they seemed to got used to the click on my shutter, some were less shy than others and were happy to be very very close to the camera.

I uploaded a video of the sounds made here:

https://youtu.be/D74INfJAVgk

UPDATE JULY 2022

A paper has now been published based on this observation, Elasmobranchs no longer the silent residents of the sea. We the 1st evidence of not one but TWO species of stingray actively producing sounds doi.org/10.1002/ecy.38