I suspect this Small White butterfly (#8, Pieris rapae) must have hatched from a caterpillar or chrysalis hidden among vegetables I bought at the market, as I found it in one of the kitchen cupboards. Cabbage White butterflies should spend winter as pupae, but likely this one emerged prematurely due to the relative warmth of our house. Red Admiral butterflies do hibernate as adults, so it’s less of a surprise that I saw one in the garden as recently as last week, on one of the sunnier days; however I don’t expect to see any more butterflies now until 2019.