This method of feeding, which is uncommon and unique to humpback whales,[1] has sparked plenty of interest. There has been some speculation behind the net of bubbles and how fish are trapped within. One study suggests that it is the acoustics from the exhalations from the whales that traps the fish.[2] It is thought that within the circle it is silent but outside the sounds have such high intensity that it is nearly impossible for fish to escape.[7]