An elephant using its trunk to grasp water plants, such as Water-Lillies, and then swish the trunkful of plants back and forth through the water or lift the trunkful out and plunge it back into the water to remove mud clinging to the roots. The elephant may also rub the roots down the underside of its trunk to dislodge more tenacious mud.
References: Poole & Granli 2021. (Full reference list)
This behavior occurs in the following context(s): Foraging & Comfort Technique