Zoologists will test Flaco superfans' claim that NYC's celebrity owl was ailing before his death.

– NYC's celebrity owl Flaco died from traumatic impact, possibly after flying into a building.

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– Fans mourn Flaco, who thrived in the wild despite captivity at Central Park Zoo.

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– Necropsy shows Flaco in good health; police seek those who released him from the zoo.

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– Main impact to Flaco's body; substantial haemorrhage noted, investigation ongoing.

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– Central Park Zoo blames enclosure tampering, but illness is also investigated.

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– Further tests planned: microscopic examination, toxicology, infectious diseases.

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– Eulogies and speculation abound about urban threats to Flaco's survival.

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– Fans note Flaco's silence before death, and speculate on illness as a factor.

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