Subterranean rodents spend most of the day inside underground tunnels. where there is little daily change in environmental variables. Our observations of tuco-tucos (Ctenomys aff. knighti) in a field enclosure indicated that these animals perceive the aboveground light-dark cycle by several bouts of light-exposure at irregular times during the light hours of the day. https://www.bekindtopets.com/limited-stock-Martin-Saddlery-Flank-Cinch-Hobble-Strap-with-BioThane-special-buy/