When the giant rests: Evidence of prolonged inactivity in the giant armadillo (Priodontes maximus) of the Pantanal

We documented prolonged inactivity (12 consecutive days), an uncommon behavior, in a giant armadillo (Priodontes maximus) in the Pantanal. Unlike previous observations in the Amazon, there was no internal activity or alternative exits, suggesting prolonged inactivity. This behavior may be associated with the need for thermoregulation, although temperature variations or environmental factors (such as fires) were ruled out. This record raises questions about the species’ energy conservation strategies, such as the causes and ecological consequences of this behavior. We recommend investigations of physiological mechanisms (body temperature, metabolism) and ecological implications, which could position the species as a model for studies of climate adaptation in tropical megafauna.