He was spotted Thursday night, as he tried to grab a caged lab rat, set out by the zoo's staff.
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The Manhattan Bird Alert tweeted out a picture of him.
The owl was briefly tangled in the trap, but flew away before zoo workers could capture him.
Rescuers are concerned that he cannot survive on his own and has not been eating.
Flaco refuses to eat any of the food that park rangers left out for him, and he can't seem to be coaxed down from the trees. Thursday night's attempt is the closest they've gotten to the owl in days.
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New Yorkers have spotted Flaco flying out on Fifth Avenue and in Central Park since he broke free last Thursday.
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