Polo fans and equestrian-lovers watched in horror as seven horses sickened and died in front of their eyes. The horses were meant to take the field for a polo match in Wellington, Florida on Sunday afternoon. Soon seven other horses fell sick. Veterinarians rushed the fields, but were unable to save a single horse. By Monday, 21 horses, all from the same Venezuelan team, had died. Now, investigators are searching for the cause. The Takeaway turns to Brian Haas, a newspaper reporter on the ground in Florida and Dr Celeste Kunz, a horse veterinarian, to try and piece together this equine mystery.