Deep into Infrasound
Https://www.youtube.com/watch?v=2_FRo2OiMwc 3-D model of the sounds made by forest elephants excited about a mating event in the Dzanga forest clearing, Central African Republic. Lowest frequencies are to the left. The height of the peaks indicates how much energy in in that frequency. Infrasound
Source: elephantlisteningproject.org