Brazilian paleoburrows?

Aliens, secret military operations or megafauna?

“burrow formed by an animal of the ancient past.”[1]

“an underground shelter (tunnel, burrow, lair, etc.) excavated by extinct paleo-vertebrate megafauna (i.e., giant mammals, such as ground sloths) that lived in the prehistoric era.”[2]

Credit: Amilcar Adamy/CPRM
Credit: Amilcar Adamy/CPRM
Heinrich Frank
Spencer G. Lucas et al
Spencer G. Lucas et al
Eduard Solà
https://www.flickr.com/photos/121958154@N04/
https://commons.wikimedia.org/wiki/User:Hectonichus
Green is the Glossotherium, blue is the Lestadon and red is the Catonyx. Credit: artbyjrc
https://www.deviantart.com/makairodonx
JOSÉ IRIARTE
Heinrich Frank

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Keep hunting for the truth.

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