You can see them with a good magnifying glass.
Out of the tip of each hair comes a little drop of sticky liquid.
This fastens the foot to any smooth surface.
Many insects have these sticky hairs on their foot pads.
When a fly walks up a window pane, it does it by gluing its feet, one after the other, to the glass.
I don't wonder you laugh.
No, Mollie, the glue does not harden and hold it fast.
The fly can easily pull its foot loose. The grasshopper cannot walk on glass quite as well as the fly. Its foot pads do not cling so well.
Would you not like to know the name of these curious little foot pads?