Brazilian paleoburrows?

Aliens, secret military operations or megafauna?

Something a little different today, but something I found really intriguing.

We will be delving (pun intended) into the underground ‘tunnels’ in Brazil that have been found winding beneath the Amazon.

What are they?

I parenthesised the word ‘tunnel’ as while colloquially correct the actual term given to these structures is paleoburrow.

Defined a paleoburrow is an

“burrow formed by…