Outrageously-plumed racegoers sip Mint Juleps from air-conditioned boxes while college students on spring break pack the infield.

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If the pack escapes before spring, when they are scheduled for release, they will likely threaten livestock, and will have to be destroyed.

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On Col d' Agnes, 45km from the finish, Luxembourg's Andy Schleck also tried to spring free but the Astana team, a permanent fixture at the front of the pack, reacted instantly and ensured their two big stars stayed out of danger.

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