Closer videos of sticky chrysomelid beetle feet in action

Here are some more video segments (as GIFs) of the sticky hairy pads of the chrysomelid beetle feet in action. It looks like the beetle can control their stickiness very rapidly. I don’t really understand how. The stickiness is caused by microdroplets of lipids on the tips of the flattened hairs of the pads on each side of the claws. But surely this liquid can’t be emitted and re-absorbed quickly enough to allow the beetle to change from walking to defensive sticking and then back to walking again in the space of a few seconds.

Front foot:

Middle foot:

Hind foot:

Lou Jost
EcoMinga Foundation