People,
Do you see the symmetry of the opening of the first image at top? That is by design and intelligent contstruction, it has nothing to do with a ginat sloth that scratched its way through the rock to create a tunnel.
If we see artificial construction techniques that speak of advanced technology, such as at the nearby (relatively speaking) Machu Pichu, then why not in relation to these caves. And where are they ? How many ?
" There are now more than 1,500 known palaeoburrows that have been found in southern and southeastern Brazil alone, and there appear to be two different types: the smaller ones, that reach up to 1.5 metres in diameter; and the bigger ones, that can stretch up to 2 metres in height and 4 metres in width."
Could it be that there are downward extensions that have been walled up, or that exist below the cave floors ?
Dean