However, zoo curator Riyaz Khan told PTI that the grey partridge, that died, was a captive bird which succumbed to injuries after being attacked by another bird at the enclosure.
"The death cannot be equated with bird flu," Khan said.
Both zoo and Shakti Sthal, the memorial of former Prime Minister Indira Gandhi, continued to remain shut. Six duck deaths have been reported from Shakti sthal in the last three days.
It set alarm bells ringing as only yesterday Delhi Development Minister Gopal Rai had termed the situation there as a "sign of relief".
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The city government has already issued an 11-point health advisory with a list of dos and dont's. It has asked people to refrain from consuming half-boiled eggs and meat.
A senior Delhi government official said that no new report has been received from both laboratories in Bhopal and Jalandhar run by the Centre, despite Rai's request to expedite the process.
The minister issued an appeal to the people to inform the authorities if there is no spray of anti-virus Sodium Hypochlorite at water bodies in their vicinity where birds gather.
The Delhi government has sent 81 samples to laboratories in Bhopal and Jalandhar so far and out of them, the city administration has received reports of 27 samples.
Yesterday, Rai had met Union Agriculture Minister Radha Mohan Singh and urged him to direct labs to expedite the test reports so that the city government can take preventive steps.
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