Common hippopotamus (Hippopotamus amphibius) roars at another in river in Serengeti National Park, Tanzania

horizontal outdoors day daytime animal sunlight competition competitive action color colour close up sunny motion communication bright communicate landmark compete africa stand colors colours teeth landmarks african vulnerable standing sunlit splash splashing communicating roar pod pods competing roaring famous place tourist destination side view tanzania serengeti national park safari animals looking away world heritage site body of water rivers copy space full length international landmark tourist attractions attractions three animals destinations animal behaviour animals animal themes ate splashes group of animals wild animal competitions communicates roars hippopotamus hippo wildlife animal theme outside nobody attraction destination travel river national parks national park color image mouth open open mouth unesco water wild animals close up tourist attraction travel destination travel destinations unesco world heritage site international landmarks non urban scene animals in the wild national landmark serengeti african animal african animals place of interest tourist destinations competes protected area national landmarks hippos colour image no one no people famous places hippopotamus amphibius safari animal holiday destination holiday destinations vulnerable species brightly lit without people cropped image wildlife photography places of interest common hippopotamus animal photography half length closeup group of hippos animal behavior