One case used to argue against endothermy or warm-bloodedness in dinosaurs is the presence of'lines of arrested growth' in their bone histology, indicating seasonal slowdown of growth. This was considered characteristic of ectothermy, as seen in reptiles and amphibians. Here Meike Kohler et al. present a study of wild ruminants - large endothermic mammalsrn- living in climates from the tropical to polar.
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