hippo and hippopotamus silhouette. world hippo day concept suitable for social media post templates, posters, greeting card

animal animals art baby backdrop background backgrounds banner banners black brochures card cards cartoon character collection concept cute day design drawing element fauna flat funny graphic grass greeting hippo hippopotamus holiday icon illustration image isolated mammal media national nature pictogram portrait post poster posters safari sign silhouette simple social style suitable sunset symbol template templates vector wild wildlife world zoo