As bird strikes are increasing rapidly, airports are coming up with many imaginative ways of dealing with bird strikes.

　　Every airport in the US uses pyrotechnics daily to drive the birds away. Pyrotechnics involves using fireworks. The bang caused by fireworks gets birds' attention and pushes them away. Bangers make a loud explosion while screamers make a whistling sound — different birds respond to different fireworks.

　　A dog called Sky has been chasing birds for five years at Fort Myers, Florida. Since 1999, when dogs were first used, there has been a 17% drop in bird strikes. While the egrets, herons and moorhens can get used to pyrotechnics, they never adapt to the presence of a natural killer like Sky, says Ellen Lindblad, at Southwest Florida International Airport. “She seems to love it，” said Ellen.

　　Pigs have been used to disrupt the habitat of the 10­15 California gulls that used to routinely fly over Salt Lake City airport twice a day. The airport had tried driving them away without success. Then a pilot came up with the idea of putting pigs on their island habitat, near the airport. The pigs ate the gulls' eggs and are now used for a few weeks every spring as a deterrent(威慑物). When the migrating gulls return in spring and see the pigs waiting to eat their eggs, they leave at once in search of another location.

　　61. According to the report, the number of bird strikes in 1990 was ______.

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