hippopotamus: massive thick-skinned herbivorous animal living in or around rivers of tropical Africa
even-toed ungulate: placental mammal having hooves with an even number of functional toes on each foot
relapsing fever: marked by recurring high fever and transmitted by the bite of infected lice or ticks; characterized by episodes of high fever and chills and headache and muscle pain and nausea that recur every week or ten days for several months