Bug legs have claws which have small, moist and slightly sticky pads that allow them to walk on walls, up-side down, etc. and defy gravity.
Here is how we demonstrated that. Take two post-it notes and glue them together so that each side has sticky side sticking towards the outside, sticky sides facing the same side. Draw on a bug and cut it out. Give it a little color to make them festive.
Bend the legs down and then the bottoms of the legs up to create the foot. Now they will stick where you put them.
Spark made ants and a tiny little ice cream cone and muffin for them to carry off.