Huddling is effective in decreasing metabolic rate permitting energy saving. However, this decrease varies among different species depending on physical, physiolagical and behavioral characteristics oí the huddled individuals. Following a general model we analyzed the effeeta of ambient temperature, thermal conductance and ontogeny on the huddling effectiveness (energy saving level froro huddling behaviour) in white roiee Mus musculus. Alao, we studied the effects of thermal conrluctance by using the Sigmodontine Abrothrix andinus as a model organism...
