Original sentence: Although most active at night, they may also move around during the day.Female Philippine warty pigs make nests in which to give birth, situated in carefully selected, concealed areas such as between the buttresses of giant trees surrounded by dense bushes (2).Females in particular can be highly defensive when protecting their young, and will attack potential predators, including people, if threatened.It has relatively small eyes and ears, and its narrow feet have four toes, but only the two central toes are used for walking (2).Litters average four to five piglets, but as many as eight may be born in a single litter (3).Long, stiff hairs form a crest running down the middle of the back (2), which is particularly conspicuous in males during the breeding season when if forms a prominent mane over the head crest and neck (2) (3).Philippine warty pigs may be seen singly, in pairs during the breeding season, or in groups of 7 to 12, consisting of a boar, several sows and young pigs.The Philippine warty pig has a long snout, terminating in a flat, mobile disc with the nostrils in the centre (2).The medium-length tail has a tuft of long, black hairs at the tip (2) (3), used to swat away flies and signal mood (4).The robustly built Philippine warty pig has a coarse, bristly, blackish coat with a scattering of silvery white hairs on the sides.The teeth are well-developed, with the large upper and lower canines forming laterally and upwardly protruding tusks in males (3).They feed on the roots, leaves and tubers of grasses and other plants, using their mobile snouts to plough the ground for such food (2).Wild pigs are normally shy and retiring but can be dangerous when cornered and will vigorously defend themselves in such a situation