[Aztlan] Palenque artifact?

[Nick Hopkins]

In the May/June 2008 issue of Archaeology magazine, there is an  
interview with a choreographer who is reconstructing precolombian  
Maya dances for the tourist park at Xcaret.  He says one of his  
sources of inspiration is from Palenque:

"For example, at Palenque we were very pleased to be able to study  
the glyphs on a stone that was found about four years ago.  It  
depicts a local chief, his mother bearing a crown, his son, and  
several rats, which symbolize secrets.  From these scenes we begin  
constructing the ceremony..."

Rats?  Can anybody tell me what he is talking about?

Nick Hopkins