So, the attacker prepares a trap for the unwary prey at a favored watering hole. Contango is a potential trap for unwary investors. Legends claimed that sirens in the waters around Sicily lured the unwary to their death. A number of traps await an unwary group. A review in "Nature" found the novel "likely to mislead the unwary". The line contains some traps that can snare the unwary. Unwary travelers or field workers were often easy targets. They have the ability to become almost invisible, making them extremely dangerous to the unwary. Dust and leaves likely concealed the liquid asphalt, which then trapped unwary animals. R and X climbs are usually noted as a caution to the unwary leader. They can cause serious injury to an unwary handler! Grackles at outdoor eating areas often wait eagerly until an unwary bird drops some food. Neither, for that matter, will unwary readers. This provides ample opportunity for surprise attacks on the unwary. The mediaeval theme of unwary trust continued into the Renaissance.