TY - JOUR T1 - Ultrasound speed in red deer antlers: a non–invasive correlate of density and a potential index of relative quality AU - Castillo, L. AU - Del Río, M. AU - Carranza, J. AU - Mateos, C. AU - Tejado, J. J. AU - López, F. PY - 2020 VL - 43 IS - 2 JF - Animal Biodiversity and Conservation