Placing the tip of the trunk over or on a dung pile and sniffing it; presumably for the purpose of assessing physical or sexual condition or individual identity. All age/sex groups Sniff-Dung, although males engage in this behavior more frequently than do females.
References: Douglas-Hamilton 1972: ch 6; Rasmussen & Schulte 1998; Poole & Granli 2003; Poole & Granli 2011 [Test-Dung]. (Full reference list)
This behavior occurs in the following context(s): Advertisement & Attraction, Attentive