Capturing the amphibian song of love

Sometimes, I have some crazy ideas to get new images that tell us something different. It is really easy, go during the reproductive period of the amphibians and take some nice and nice pictures of them with the help of a flash during the night, but sometimes, when you spend a lot of time observing nature, things are shown, that a priori They are hidden. This is the case of this idea, I saw several male amphibians singing, but I also noticed that they do not move at all during their chorus, this is the case of this species, Epidalea (Bufo) calamita, in this case a male of this species was my model. He swells the gular sac at the same time that it deflates the belly, and after that it deflates the gular sac and inflates the belly making its sound of love, repeating this movement incessantly ... I placed my camera at ground level and for 30 seconds I kept the camera open to capture these movements, with the light of night, however I also captured the static position of a part of the body while he sang his love.