Summer feeding and bedding habitat selection by blue sheep (Pseudois nayaur) in Helan Mountains Habitat selection of sympatric blue sheep (Pseudois nayaur) and red deer (Cervus elaphus alxaicus) during rutting periods in the Helan Mountains, China Habitat suitability assessment of blue sheep in Helan Mountain based on MAXENT modeling Seasonal variations in group types and sizes of blue sheep (Pseudois nayaur) in the Helan Mountains, China Genetic diversity based on cytochrome b gene analysis of different geographic populations of blue sheep in China