Boomerang Butt...
You usually get comments from the pax of a smell of "roast chicken" after a bird is ingested, and I haven't seen any suggestion of that. Not impossible, but unlikely.
Perhaps, unless the birds just collided with are seagulls. Hit a flock of them on approach to LAX in the late 1980's. Injested by all three engines of a DC-10. We smelled fish-birds on the flight deck about 2 seconds after impact. It was a flock of maybe 20-30 seagulls. The engines didn't react one iota. They were at stable fully configured for landing at about 1500 feet and probably 150+- knots.