When walking in rural England in spring, sometimes you can find a sign "Lambing!" on gates or fences. It refers to the time when sheep give birth to lambs.
Lambing is a busy time for any farmer and a lovely one for kids. Visit a farm from late winter till late spring to see for yourself. You can even participate in bottle feeding the lambs. You can clench them, pat their soft swirled wool. Lambs are very attentive and watch the visitors intently. They often run in pairs. Adult lambs are not particularly shy, but they won't allow you too close.