Inserting the trunk deep into the mouth cavity and down into the pharyngeal pouch, sucking water therein into the trunk and either swallowing it or blowing it onto the body for cooling. This behavior is more likely to be observed in habitats, or seasons, that are very hot. Typically an elephant uses this technique to cool its own body, but mothers have been sighted spraying the bodies of their calves.
It is a hot dry season day. Allomother V-Notch is resting under tree with Mama Little E and Little E. First she seems to put something in her trunk, swing it high and then blow it (grass/dust) out. Then she starts Trunk-Sucking but puts the tip of her trunk way back in and one can hear and see her suck up water - as if she has inserted her trunk into her pharyngeal pouch. Then it sounds as if she swallows the water - as if she has squirted it into her mouth.
At the same time Little E decided to walk forward and emits a Low Intensity Husky-Cry. As he does his mother responds by touching his genitals (Trunk-to-Genitals) and he respond with a High Intensity Husky-Cry. She and V-Notch Coo-Rumble and V-Notch also give him a Trunk-to-Mouth touch so he Husky-Cry again. (Maasai Mara, Kenya)