continuous one line drawing happy little girl riding strong hippo. child sitting on back hippopotamus in zoo. kids learning to

abstract africa animal banner beast cheerful child childhood continuous line contour drawing fauna friendly friends fun funny girl graphic hand happy herbivore hippo hippopotamus jungle kid lines art little mammal mascot monoline nature one outline print rider riding safari savanna simplicity single sketch tropical vector white background wild wildlife zoo strong hippo sitting back zoo kids learning ride hippopotamus draw design