Silly-Trunk
Flopping the trunk about. This behavior is commonly observed among newborns, though not among older individuals. It does seem as if the infant does not know what to make of its long nose and Silly-Trunk is part of the infants learning how to use and control it.
References: Poole & Granli 2021. (Full reference list)
This behavior occurs in the following context(s): Lone & Object Play, Maintenance