motionless hippo in mud facing camera, yellow-billed oxpecker hop away, medium close shot

hippopotamus hippopotamus amphibius hippo mud conservation wildlife herbivore oxpecker mammal dirt maggot pachyderm africa environment zimbabwe tanzania protection parasite africanus pinworm dangerous symbiosis fauna unspoiled big safari zambia wild massive wilderness buphagus ear fearless water lazy nature yellowbilled peck hop outdoors eye birds