RF2C2YHTK–Black bird standing on top of head of resting common hippopotamus (Hippopotamus amphibius), Ngorongoro Crater, Tanzania, Africa

RMW3981B–Hippos out of water, Ngorongoro Crater, Tanzania

RF2DBEHEP–Hippopotamus on water. Ngorongoro Conservation Area crater, Tanzania. African wildlife

RF2C2YH6G–Close up of bird walking on common hippopotamus (Hippopotamus amphibius), Ngorongoro Crater, Tanzania, Africa

RM2JA8T1J–Hippo in Ngorongoro Crater, Tanzania

RME8PBCX–Hippopotamus looking into the camera with head on the back of another

RMTRP7EX–Hippos out of water, Ngorongoro Crater, Tanzania

RF2A39J27–Hippo (Hippopotamus amphibius) in fresh grass in daylight, Ngorongoro Crater, Tanzania

RFW6H8B4–Side-view head shot of yawning Hippopotamus (Hippopotamus amphibius) in Ngorongoro Conservation Area; Tanzania

RMTRP7EF–Hippos out of water, Ngorongoro Crater, Tanzania

RF2A39J22–Pair of hippos (Hippopotamus amphibius) in open, one with wide open mouth, Ngorongoro Crater, Tanzania

RMEDC70Y–Landscape with lake, yellow-bark acacia (Acacia erubescens), reeds and a group of Hippo (Hippopotamus amphibius) resting on the