The term 'Hulking Herbivore' refers to three large animals: the MOOSE (5 letters), HIPPO (5 letters), and Water Buffalo (12 letters). The MOOSE is a large deer-like mammal native to North America, Europe, and Asia. The HIPPO is a large semi-aquatic mammal found in sub-Saharan Africa. The Water Buffalo is a large bovine found in South and Southeast Asia. All three of these animals are herbivores, meaning they feed on plants rather than meat.