Jets are extremely sophisticated machines. It can chew up bird bones, but not without clogging the very fine tolerances and air path needed for compression and the production of thrust.
Not to mention turbine blades are not meant for cutting, especially at the extremely high speeds that they will hit birds. I work in aviation repair and have seen the nicks and dents created in them. Every little imperfection is a loss of efficiency, so a big deformation on multiple blades might be enough to kill the jet’s power entirely.
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