Long feelers would come down to the paca's feet in height (or shorter). For snekkets, this would be feelers that reach no further than their hind legs.
These include animal ears, simple objects (fruits, vegetables, etc), and basic wing-like feelers. Not included; bat wing ears, very complex shapes.
These do not have layers or holes. A rare pacapillar can have5-9 head feelers arranged in any way as long as they are around the head feeler area.