Study methods and procedures for ungulate food habits Variations in food habit and viscera organ morphology of four rodents in Shennongjia, central China Summer diets of Sympatric Blue Sheep (Pseudois nayaur) and Red Deer (Cervus elaphus alxaicus) in the Helan Mountains, China Ontogenetic shifts in sexual dimorphism in head size and food habits of Eremias brenchleyi