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rhinoceros animal wildlife nature africa savanna grassland herbivore endangered conservation white black grey horn tusks poaching illegal trade habitat loss extinction threatened vulnerable rare protected species mammal herbivorous grazer browser solitary territorial aggressive powerful fast endurance sight smell hearing touch taste intelligence social family group herd bonding communication vocalizations body language gestures facial expressions adaptation evolution environment climate change ecosystem food chain web predator prey competition survival life death birth reproduction growth development maturity aging senescence longevity health disease injury parasite predator prey threats conservation status population decline increase stable fluctuating range distribution habitat loss fragmentation degradation protection sanctuary reserve park zoo education awareness research monitoring conservation efforts success failure future hope extinction prevention survival species