Which of these is a characteristic feature of wild boar piglets?

Wild boar ('Sus scrofa'), also known as wild pig, is a species of the pig genus 'Sus', part of the biological family 'Suidae'. The species includes many subspecies. It is the wild ancestor of the domestic pig, an animal with which it freely hybridises. Wild boar are native across much of Northern and Central Europe, the Mediterranean Region (including North Africa's Atlas Mountains) and much of Asia, including Japan and as far south as Indonesia. Populations have also been artificially introduced in some parts of the world, most notably the Americas and Australasia. Elsewhere, populations have also become established after escapes of wild boar from captivity.

Wild boar piglets are coloured differently from adults, having marbled chocolate and cream stripes lengthwise over their bodies. The stripes fade by the time the piglet is about 6 months old when the animal takes on the adult's grizzled grey or brown colour.