Dozens of them, only seven days old, are just sprouting feathers on the tips of their wings. And you can take one, even two of these home, for less than what you'd pay for a burrito.
"You'll want to buy at least two, since they crowd together to stay warm," said Victoria Veitch, 22, who works year-round at the fairgrounds and tends the little birds at this year's fair. "And you'll need a heat lamp until they get all their feathers."
If you've got some small bills ($6 for chicks, $8 for ducklings and baby turkeys) and are at least as old as Victoria (22 is the minimum age to purchase a bird), a feathered friend can be yours to keep.
"Serious buyers looking to start a coop go for the females, since they lay eggs," Veitch says. "Small kids like the boys: they're a pretty color, but they make a lot of noise."
The ability to take the barnyard home could be key to the Agventure Park's success at the fair. Gone are the days of being told to "look, but not touch" -- every fairgoer of a certain age can take home a piece of the action.
And, if you prefer fur to feathers, tiny rabbits are only steps away.
"I've never even held a bunny! I don't know how to hold a bunny!" said Madison Yeh, 22, of San Leandro, as she pulled her new pet out of his box. Yeh said she hadn't planned on acquiring a new member of the family at the fair.
"My boyfriend bought him for me," she said, stroking the fur of her 3-month-old
Rabbits start at $25 and range from tiny lops like Yeh's ($40) to Flemish giants, the size of a beagle. And, you only have to be 18 to buy a bunny.
But is caring for a rabbit or chick harder than caring for a dog or cat? A cage and a litter box, or a coop and a heat lamp, are apparently all it takes to start off.
"When they're little, the birds need water in a shallow dish, or they'll drown," Veitch said. "As they get older, birds do best in a partial-terrestrial environment. A backyard with some water, a pond."
The rabbits require less space to roam. Yeh and her boyfriend, Joseph Kotake, 23, will take the bunny home to an apartment, where it will join their puppy. Still, the yet-unnamed rabbit will have its own space.
"He'll have his cage, he'll have his box. And of course, we'll be careful with cords," Kotake said.
Any other advice from exhibit staff to would-be pet owners?
"Treat them as if they're a part of your family. As they get older, they'll follow you around like you're its mother," Veitch said.
"And," she added, "Don't run from the turkeys. They'll chase you."
Contact Erin Ivie at 510-293-2469. Follow her at Twitter.com/erin_ivie.
The fair runs through July 8 at the fairgrounds, 4501 Pleasanton Ave. It is closed Mondays. There are free fireworks on Fridays, and free concerts nightly at 7 p.m. Admission is $10, $8 for seniors, $6 for ages 6-12. For details, visit alamedacountyfair.com.