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updated: 4/23/2013 7:04 PM

Baby bison arrive at Fermilab

In the end, a dozen bison could be born

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  • Video: Bison calves at Fermilab

  • A mother bison watches over her day-old calf as they bathe in the early-morning sun at Fermilab in Batavia on Tuesday. Several other calves are expected to be join the herd soon.

       A mother bison watches over her day-old calf as they bathe in the early-morning sun at Fermilab in Batavia on Tuesday. Several other calves are expected to be join the herd soon.
    Rick West | Staff Photographer

  • A 2-day-old bison calf goes for a run under the watchful eye of its mother at Fermilab in Batavia Tuesday. Calves were born Sunday and Monday, and another eight to 10 may be yet to come.

       A 2-day-old bison calf goes for a run under the watchful eye of its mother at Fermilab in Batavia Tuesday. Calves were born Sunday and Monday, and another eight to 10 may be yet to come.
    Rick West | Staff Photographer

  • A 1-day-old bison calf follows its mother and is trailed by his 1-year-old brother at Fermilab in Batavia Tuesday.

       A 1-day-old bison calf follows its mother and is trailed by his 1-year-old brother at Fermilab in Batavia Tuesday.
    Rick West | Staff Photographer

  • A newborn bison calf gets a bath from its mother at Fermilab in Batavia Tuesday. The calves were born Sunday and Monday.

       A newborn bison calf gets a bath from its mother at Fermilab in Batavia Tuesday. The calves were born Sunday and Monday.
    Rick West | Staff Photographer

 
 

It's a bouncing baby bison.

And another one. And another one.

Spring is birthing season for the resident plains bison herd at Fermi National Accelerator Laboratory in Batavia.

Two have been born this week, one Sunday and one Monday. The lab expects another eight to 10 to come along soon.

Bison have a 9-month gestation period; the calves can weigh up to 66 pounds, according to the American Bison Society. For the record, though, there was one born at a zoo last year that weighed 125 pounds. The sex and the weight of the Fermi babies had not yet been determined as of Tuesday.

The lab has 24 bison. It will sell any of the females born, to limit the herd to the 20s, because a part-time worker manages it. The lab also wants to avoid inbreeding.

Fermilab's first director, Robert Wilson, brought in a herd in 1969. He wanted to honor the heritage of the laboratory site, and preserve an iconic image of the American prairie.

They have become a symbol of Fermilab's work on the frontiers of high-energy physics.

The babies will grow up to stand 5 to 6.5 feet tall and eventually weigh as much as 2,500 pounds.

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