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.roneverhart.com/BarConic-Juice-Pourers-Neck-Only-Color-Options/