ducks

シアトルのユニオン湖にかかる橋で衝突事故があり，邦人学生も被害に会いました。ここのducksとは何を指していますか。luaさん，どうぞ。（Hey say yulp）

4 dead, 2 critically injured in collision between Ride the Ducks vehicle, charter bus on Aurora Bridge

Four North Seattle College students were killed and numerous others have been injured in a collision between a Ride the Ducks tour vehicle and a charter bus on the Aurora Bridge.

http://www.seattletimes.com/seattle-news/ride-the-ducks-vehicle-collides-with-bus-on-aurora-bridge/