I think that homo sapiens comes first, but if referring to other animal species, some have also a "big appetite" - from the biggest ones like whales and elephants, to small species, like bats, shrews, birds like humming birds with high energetic needs, amphibians or insects, or species feeding on less nutrient food, like pandas, koalas, etc., or on irregularly available food, like various predators, from sharks to tasmanian devils, African wilddogs, hyenas, gluttons (wolverines), badgers, prey birds and vultures, reptiles, etc., or animals going through longer periods without food, like hibernating species, i.e. bears, marmots, etc.:
http://www.bbc.com/earth/story/20170410-the-blue-whale-is-not-the-only-animal-with-a-huge-appetite
http://www.top10listland.com/top-10-animals-that-can-survive-without-food/
Further, there are certain rather unpleasant insect species, like mosquitoes and other blood-sucking creatures - and even useful ones like leeches (sanguisuga) ...