in even cooler temps in habitat due to the sunlight being more intense than here in Houston ( for the most part). Baby chucks and Yarrows are both active year round here--- last year I saw both "nosing" out from under rocks at 39F. Baby chucks like it in the mid to upper 50's with bright sun before they start feeding as opposed to Yarrows . Jerry, do you know of some links to herp studies & such with scientifical type info ?? All of Jaffo's links lead to a peaceful place with wonderful flying fairies, nymps, dragonslayers, dirty diapers and lost crystals--but no herp info!