Why does the Air Force test for the type of bird after a bird gets sucked into an engine?

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References:

The Air Force Is Trying New Strategies To Battle A Constant Problem: Birds On Airfields
https://americanhomefront.wunc.org/2019-03-11/the-air-force-is-trying-new-strategies-to-battle-a-constant-problem-birds-on-airfields

Keeping Birds out of Jet Engines
https://www.americanscientist.org/article/keeping-birds-out-of-jet-engines