DENVER (AP) _ Denver International Airport is using what it describes as ``pigeon LSD″ to try to rid the parking garages of the messy birds.

The pigeons are an annoyance to travelers who find droppings all over their cars, and could become a health hazard, officials said.

Corn soaked in the drug Avitrol has been scattered around the parking garages.

Avitrol is supposed to make birds forget their whereabouts, but it has made some forget how to fly. About 100 pigeons have crashed and died.

``Our hope is the chemical will disorient them and they will go somewhere else,″ airport spokesman Chuck Cannon said. ``But we’ve lost some pigeons in the bargain.″

Avitrol should be a last resort, said Doug Trowbridge of the American Humane Association.

``The health problems created by pigeons are next to nil,″ he said. ``Besides, it’s a temporary fix. Other pigeons are going to move in.″

Officials previously tried wire mesh, bright balloons and other techniques to get rid of the birds, and they all failed.