Actually, I think all CHE's emit infrared...at least they are labeled as such. It's just not visible to us, and likely not visible to them.
http://www.zoomed.com/db/products/E...iO3M6MToiMCI7czo4OiJTZWFyY2hfeSI7czoxOiIwIjt9
http://www.zoomed.com/db/products/E...iO3M6MToiMCI7czo4OiJTZWFyY2hfeSI7czoxOiIwIjt9