Their website says it can be used for chickens. It mentions "soft woods" such as spruce, fir, and pine in the FAQ section, but their product packaging/specific page(s) don't seem to mention what kind of wood is used (perhaps it is a combination of the above mentioned woods)... It seems like they're marketing the product for horses primarily, but the site does mention chickens specifically. Since they offer a range of sizes (sawdust, fine, medium, pellets, etc.), it might be a good idea to email them directly to see what they suggest for chicken litter.