As older children milled around the livestock area at Napa Valley Exposition Tuesday, 2-year-old Lily Dumitrescu attentively took in the action in the sheep pen.

“Oh boy, look at that!,” said her mom, Hilary Dumitrescu, as one ewe balked as it was led away to be sheared.

Intrigued, Lily watched every step. Lily was among the 950 visitors who attended the 5th Annual Day at the Farm, a free event organized by the Napa County Farm Bureau and the Napa County Agricultural Commissioner’s Office in honor of National Agricultural Week.

Dressed in his glassy-winged sharpshooter “Sharpie” mascot outfit, Napa County Deputy Agriculture Commissioner Jeff Erwin greeted boys and girls as they walked by — or ran away, scared — in an effort to remind everyone to be on the lookout for the pest that spreads Pierce’s disease, a vine killer.

While “Sharpie” was strange to some of the attendees, others found him funny and chummy.

“That’s probably one of the nicest sharpshooters there is,” said 9-year-old Ben Weslow as he and fellow third-graders walked by the livestock area at Expo.

The kids also climbed on tractors, checking out a grape harvester. They watched worms squirm in compost, participated in quizzes on water and soil conservation and ate grapes at the Grape-to-Bottle display. The visitors also petted piglets and goats, and took a gander at sheep, alpacas from Wooden Valley and other animals.

Judd Redden sheared half-a-dozen breeding ewes from Vintage High School Farm, giving them 10-minute haircuts while holding the animals on their back. Hundreds of kids watched, mesmerized.

Afterwards, Katelyn Johnson, 8, said the sheep did not seem to like it much.

“It looks like it was not in the position it wanted to be in,” she said.

Nearby, Heston Nunes, an instructor with the Dairy Council of California, introduced Jasmine, a 4-year-old Holstein cow from Sonoma County.

As he explained the facts on milking and cows, Jasmine stood inside her trailer, chewing quietly while keeping an eye on the crowd.

Lisa Tary, the mother of a third-grader, found the event educational and fun.

Her son and his three friends were kept entertained for 90 minutes, she said, no easy feat.

“I just think it’s a program for all ages,” she said.