i think it may be called like repti-bark or something like that... they sell it in big bags for reptiles and tortoises and such well when i used it it really irritated my jenny she was always sneezing and it was kinda dusty and she just didn't like it.. so i finally switched substrate to cypress mulch and her sneezing had gone away so i think it may have to do with that substrate just a little warning if any of you are thinking of using it ...