Photo: Troy Alexander / Tambopata Research Center
Mysterious little structures found in the Peruvian Amazon are stumping some of the top scientists in the world.
Troy Alexander, a graduate student at Georgia Tech, first spotted the structure on June 7 on a blue tarp near the Tambopata Research Center, in southeastern Peru.
Alexander later saw these tiny structures, only 2 centimeters (.78 inch) across, on tree trunks in the rainforest.
Regardless of which creature constructed this environmental oddity, it has had many scientists scratching their head.
What do you think created these unique structures?
Check out more images below.