Vets Investigate Wellington Polo Pony Deaths

The sudden death of 21 polo horses in Florida may have been caused by a toxin that has yet to be identified by tests and could have been in the animals' feed, vitamins, or supplements, veterinarians said Monday.

The horses from the Venezuelan-owned team Lechuza Caracas became sick just before a tournament Sunday, collapsing and dying on the scene or while being treated at

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