I was observing my specimens this morning in complete darkness. (I decided to get out my nightvision rig) All three specimens were exhibiting luring behavior with all of their toes, very similar to various Bufonidae.

I dumped the goggles and got out a flashlight. I then added some D. hydei to their enclosure. As expected, the tow wiggling increased in the presence of food animals!

I tried to take video as the position they sit in to do this behavior is rather unusual. It is rendering now, so I will see if I was able to catch the detail...

Will update with video or drawings once the sun comes up.