A Flickr account by CIAgov has some entertaining photos of technology that mimics nature. There are robots that look like a catfish, or a dragonfly, and then there is the rock and stick “seismic intruder detection device”:

This Cold War-Era intrusion detector was designed to blend in with the terrain. It can detect movement of people, animals, or objects up to 300 meters away. The device is powered by tiny power cells and has a built-in antenna. Its transmitter relays data from the device findings via coded impulses.

I will never look at dog poop the same way again.