a indian rhinoceros grazes in a naturalistic enclosure, its thick, textured skin adorned with wet clay

herbivorous indian rhinoceros unicornis rare conservation tropical onehorned dangerous horned big rhino wildlife mammal nature zoo enclosure grassland vegetation herbivore protection environment ecosystem animal textured skin horn large powerful captive zoology biology protect preserve save endangered vulnerable threatened deforestation poaching responsible sustainable planet earth life beauty wonder inspiration hope grazes naturalistic thick adorned wet clay