Often described as ghostly, the elusive Japanese serow lives in the wooded mountains of central and southern Japan. Typically solitary, it stands on rocky outcrops, staring down at the landscape for extended periods — likely watching for predators or rivals. It can be active both day and night.

A male Visayan warty pig can become four times larger than a female. During mating season, the male uses his tusks for combat and three pairs of warty growths on his face for defence — he also grows a 23 cm (9 in) long mane to attract females. The species is only found on two Philippine islands.